What does a student learn in StateTennessee,GradeGrade 9,SubjectScience?

Students learn how Earth fits into the larger universe, from its position in the solar system to the scale of galaxies and the history of the cosmos.

Engineering and technology shape everyday life, and science explains why they work. Students explore how scientific discoveries lead to new tools, and how those tools change what scientists can learn next.

Students study what matter is made of and how it changes when substances interact. That includes atoms, molecules, chemical reactions, and the rules that govern when matter transforms from one form into another.

Students study how living things interact with each other and their environment, tracing how energy moves through a food web and what keeps an ecosystem stable or pushes it off balance.

Students study how forces like gravity and friction cause objects to speed up, slow down, or change direction. They also explore what keeps things balanced and stable when forces act on them.

Students study what matter is made of and how substances change when they interact. That means learning why ice melts, why rust forms, and what happens inside a chemical reaction.

Living things are built from molecules that carry out the work of cells, tissues, and organs. Students study how those structures connect, from DNA up to whole organisms, and how each level keeps the body running.

Students study how living things interact with each other and their environment, tracing how energy moves through food webs and how ecosystems respond to change over time.

Students study how living things are built and how they work, from the molecules inside cells up to the organs and systems those cells form.

Students examine what matter is made of and how substances change when they interact. They study atoms, chemical reactions, and the properties that make one material behave differently from another.

Living things in an ecosystem depend on each other and on their environment to survive. Students study how energy moves through food webs and what happens when something in the system changes.

Students study how matter is made, how it changes, and why some substances react with others. This covers atoms, molecules, chemical reactions, and the physical and chemical properties that make each substance behave the way it does.

Students learn how Earth fits into the larger universe, from its place in the solar system out to galaxies billions of light-years away. The focus is on how scientists know what they know, using light, gravity, and motion as evidence.

Students examine what matter is made of and how substances change when they interact. This covers atomic structure, chemical reactions, and the properties that make one material behave differently from another.

Students study how forces like gravity and friction change the way objects move or keep them still. The core question: why do things speed up, slow down, or stay put?

Students trace how life on Earth has changed over time, from shared ancestors to the variety of species alive today. The focus is on what drives those changes and why some traits survive while others disappear.

Students study how Earth's major systems (the atmosphere, oceans, land, and living things) interact and shape one another over time.

Students apply scientific ideas to real-world problems, like designing a solution to reduce pollution or testing materials for a bridge. The focus is on using what they know in science to make practical decisions.

Students study how energy moves, changes form, and stays conserved across physical systems. This covers heat, motion, waves, and the work done when forces act on objects.

Students study why objects move, stop, or stay put. They learn how forces like gravity and friction act on objects and how those interactions explain everything from a rolling ball to a car crash.

Students trace how species change over time through natural selection, explaining why some traits spread through a population and others disappear.

Living things in an ecosystem depend on each other and on their environment to survive. Students study how energy moves through food webs and what happens when something in the system changes.

Students study why objects move, stop, or stay still. They learn how forces like gravity and friction act on objects and how those interactions can be predicted and described with math.

Students study how Earth's oceans, atmosphere, land, and living things interact as one connected system. Changes in one part, like a warming ocean, ripple through the others.

Students study how Earth's layers, oceans, atmosphere, and living things interact and shape one another over time.

Students study how energy moves, changes form, and affects matter, from a ball rolling down a hill to electricity lighting a room. The focus is on where energy comes from, where it goes, and why none of it disappears.

Students learn how traits pass from parents to offspring and why siblings can look different even when they share the same parents. The focus is on genes, variation, and why no two individuals are exactly alike.

Students study how waves carry information, from radio signals to fiber-optic cables. They learn what makes waves behave the way they do and how engineers use those properties to build the technologies that transmit sound, light, and data.

Students study how energy moves, changes form, and stays conserved across physical systems. That includes heat, electricity, motion, and waves.

Students study why objects move, stop, or stay still by exploring the forces acting on them, from gravity pulling objects down to friction slowing them. Chemistry connects those forces to how atoms and molecules hold together or pull apart.

Students study how energy moves and changes form, from chemical reactions to heat and light. They learn to explain why some reactions release energy and others absorb it.

Students examine how life on Earth has changed over time and why species look both similar and different. They trace how evolution, adaptation, and genetic variation explain the diversity of living things.

Students examine how human choices, from burning fuel to clearing land, change Earth's air, water, and ecosystems. The focus is on understanding those effects well enough to weigh real trade-offs and think through solutions.

Students study how waves carry energy and information, from sound and light to radio signals. This covers how waves behave, how they interact with matter, and how technologies like phones, medical imaging, and fiber optics put them to work.

Students examine how human activity shapes Earth's land, water, and atmosphere, and how natural events like earthquakes or droughts affect where and how people live.

Students examine how life on Earth has changed over time, tracing the evidence for evolution and explaining why species alive today look both similar to and different from their ancestors.

Students study how energy moves, changes form, and affects the physical world, from heat flowing through a metal rod to electricity powering a circuit.

Students trace where energy goes during chemical reactions, including how heat is released or absorbed when bonds break and form.

Students study how engineering and technology shape society, and how science makes both possible. They trace the connections between a new tool, the science behind it, and the real-world effects it produces.

Students examine how humans depend on Earth's resources and how human activity, from mining to burning fuel, shapes the land, water, and air around us.

Students examine how human decisions, from building cities to burning fuel, shape Earth's land, water, and climate. They also study how natural events affect human communities and what people can do to reduce the risks.

Students explore how engineering and scientific discovery shape each other, and how both shape the technology and social systems people rely on every day.

Students study how waves carry energy and information, from radio signals to medical imaging. They learn how the same physics behind a ripple in water also drives the technology in phones, speakers, and X-ray machines.

Students study how waves carry energy and information, from sound and light to the signals behind radios, phones, and medical imaging. The focus is on how those wave properties get put to work in real technology.

Students explore how engineering and technology shape science, and how scientific discoveries feed back into new tools and systems that affect everyday life.

Engineering and science feed each other. Students explore how new technologies shape society and how social needs push scientists and engineers to solve new problems.

Students apply scientific ideas to real-world problems, like designing a water filtration system or evaluating a product's environmental impact. The focus is on using what they know to make decisions and solve practical problems.

Students study how engineering and technology shape society, and how science makes new technology possible. The focus is on real tradeoffs, like cost, safety, and unintended consequences, that come with any human-made solution.

Students read graphs and write equations that show how a moving object speeds up, slows down, or changes direction over time. They track position, speed, and acceleration together to build a complete picture of the motion.

Students use algebra to solve motion problems where something moves at a steady speed or picks up speed at a constant rate, all along a straight path.

Students solve equations that connect how fast something spins to how far it travels along a curved path. A point on the edge of a spinning wheel moves faster than a point near the center, and this standard is about calculating exactly how much faster.

Students draw diagrams that show every force pushing or pulling on an object, then use those diagrams and Newton's laws to predict where the object will be after a constant combined force acts on it.

Students use a formula to calculate the pulling or pushing force between two charged particles, then compare how that electric force behaves over distance versus how gravity does.

Objects keep doing what they're doing until a force changes that. Students gather evidence to show that balanced forces leave a stationary object still or a moving object at the same speed and direction.

Students run experiments to figure out why a heavy shopping cart is harder to stop than a light one moving at the same speed. The results lead them to Newton's second law: force equals the rate at which momentum changes.

Students design and run an experiment to test whether a heavier object requires more force to reach the same acceleration as a lighter one. They collect data and check how well it fits Newton's second law.

Students track how an object moves by measuring where it starts, how far it travels, how fast it goes, and whether it speeds up or slows down. Then they use those numbers to find patterns and make predictions.

When you push on something, it pushes back with equal force. Students use everyday examples like a book resting on a table or a magnet attracting metal to show how paired forces always act in opposite directions.

Students plot graphs showing how a moving object speeds up, slows down, or changes direction based on forces acting on it. The graphs connect measurements like position, time, and speed into a visual picture of motion.

Students plug mass and distance values into Newton's gravity formula to find the gravitational pull between two objects. The same formula works in reverse to solve for an unknown mass or distance.

Students track objects moving in a straight line, then plot how far they traveled and how fast they were going on two different graphs.

An object keeps doing what it's doing until something pushes or pulls it. Students explain why a parked car stays still and why a hockey puck sliding on ice keeps going at the same speed in the same direction.

Students solve math problems about objects moving at a steady speed or speeding up at a steady rate, all in a straight line. Think a car on a highway or a ball rolling down a ramp.

Students learn why a longer collision hurts less. They apply the relationship between force and time to evaluate safety devices like helmets and seatbelts, then refine a design that spreads impact force over a longer moment to protect the object inside.

Students use Newton's second law to figure out how a heavier or lighter object responds when you push or pull it harder or softer. They work with equations and graphs to connect force, mass, and acceleration.

Students design and run an experiment to test how force, mass, and acceleration are connected, then use F=ma to explain what the numbers show.

Students measure how falling objects speed up, then level off once air resistance matches gravity's pull. Experiments show that drag grows with speed until the two forces balance, which is called terminal velocity.

Students build a model to predict how far a thrown or launched object travels before hitting the ground. The prediction uses starting height, launch speed, and launch angle.

When two objects push or pull on each other, the forces they swap are equal in size and opposite in direction. Students learn to name both forces in any interaction, like a foot pushing a floor and the floor pushing back.

Students calculate the total momentum of two or more objects before and after a collision to show that, with no outside force acting, the total stays the same. This is the math behind why billiard balls, bumper cars, and rocket engines behave predictably.

Diagonal or curved motion, like a thrown ball, is treated as two separate movements happening at once: side to side and up and down. Students analyze each direction independently to predict where the object will land.

Students test what keeps a moving object traveling in a circle instead of a straight line. They find that a steady sideways force, like a string pulling inward, is what bends the path into a circle.

Students design and test a device that absorbs or redirects impact so an object survives a collision with less force acting on it. Think crumple zones, padding, or bumpers.

Students figure out why an object moving in a circle (a car rounding a curve, a ball on a string) still needs a constant push toward the center even when its speed stays the same. That inward force is what keeps the path curved instead of straight.

Students set up a wire, run electricity through it, and observe how it affects a nearby compass needle. The experiment shows that moving electric current creates a magnetic field.

Friction is the force that slows or stops objects rubbing against each other. Students describe how rough or smooth a surface is, how hard two surfaces press together, and how those factors change the strength of friction.

Students calculate the momentum of two objects before and after a collision, then show the total stays the same whether the objects bounce apart or stick together.

Students calculate how much force, applied over a period of time, is needed to speed up, slow down, or redirect a moving object. This connects the push or pull on an object to how much its motion actually changes.

Students design and run experiments to compare how strongly molecules in a substance or mixture attract each other. The goal is to see how those attractions differ across different materials.

Students use Newton's law of universal gravitation to predict what happens to the pull between two objects when one gets heavier or they move farther apart. More mass means a stronger pull; more distance means a weaker one.

Mass measures how much matter is in an object; weight measures the gravitational pull on that object. Students use SI units (kilograms for mass, newtons for weight) to tell the two apart and explain why they change independently.

Students predict which liquid will boil first or which solid will melt more easily by looking at how electrons are arranged inside each molecule. That arrangement determines how strongly molecules cling to each other.

Students draw or diagram the forces acting on an object that is sitting still or moving at a constant speed, showing that all pushes and pulls balance out.

Students learn why some reactions happen fast and others slowly. They run experiments and use math to show that reaction speed depends on how often molecules collide and how hard they hit.

Students figure out how fast a chemical reaction moves by studying patterns in data and writing an equation that predicts the rate. It's the math behind why some reactions finish in seconds and others take hours.

Students draw diagrams showing the upward push of water against the downward pull of gravity to explain why some objects float and others sink. Density determines which force wins.

Students calculate whether a chemical reaction will keep going, reverse, or stop by comparing the amounts of reactants and products using equilibrium constants. Lab work includes setting up and solving equilibrium expressions for real reactions.

Students measure the upward push water puts on objects that float or sink. They run their own tests to figure out what affects that force.

Students calculate the pH and percent ionization of acid and base solutions to explain why some acids and bases fully break apart in water while others only partially do.

Students learn why airplane wings create lift and why a shower curtain blows inward: faster-moving air has lower pressure. They connect that idea to real objects where differences in fluid speed create push or pull forces.

Buffer systems keep solutions from swinging wildly in acidity when small amounts of acid or base are added. Students calculate how well a buffer holds steady using the Henderson-Hasselbalch equation, including buffers found in blood and other biological systems.

Students map out how electrons are arranged around an atom and use that map to explain patterns on the periodic table, like why some elements react easily and others don't.

Students use diagrams or models to explain why ice melts, water boils, or gas turns to plasma by showing how heat moves and how fast molecules are moving in each state.

Students trace how scientists have changed their picture of the atom over centuries, from a simple solid sphere to today's quantum model. The goal is understanding that scientific ideas update when new evidence arrives, not that one person simply got it right.

Students use the Bohr model to identify the parts of an atom: protons and neutrons packed in the center, electrons orbiting outside. They also describe how the number of each particle determines what element the atom is.

Students model what happens inside an atom's nucleus during fission, fusion, and radioactive decay, showing how the nucleus changes and why each process releases energy.

Students run an experiment to see how pressure, volume, and temperature in a gas affect each other, then plot the results on a graph.

Students identify real-world uses of radioactive decay, such as medical imaging, cancer treatment, or carbon dating. They explain in their own words why these processes matter outside the classroom.

Students collect measurements and run calculations to figure out what elements make up a compound and in what amounts. Think of it as reverse-engineering a recipe to find the exact ingredients inside.

Kinetic molecular theory explains why matter behaves the way it does when it heats up, cools down, or changes state. Students use the idea that molecules are always moving to explain temperature, heat transfer, and why solids, liquids, and gases expand or shrink.

Students use the periodic table to predict how an element will behave, including how easily it reacts, how large its atoms are, and what kind of ion it forms, based on where it sits on the table.

Students look at evidence from an experiment or observation and argue whether a substance changed form (like ice melting) or became something new entirely (like wood burning). The focus is on building a case with real evidence, not just a guess.

Students read temperature data from a calorimeter experiment and use it to draw a phase diagram, explaining why temperature holds steady during a phase change and rises or falls at a steady rate everywhere else.

Students draw and interpret different diagrams of an atom, showing where its electrons sit. These models include dot diagrams, shell diagrams, and written electron arrangements.

Crystalline solids (like salt or quartz) have particles locked in a repeating pattern, giving them sharp melting points and predictable properties. Amorphous solids (like glass or rubber) have particles arranged randomly, so they soften gradually instead of melting at a fixed temperature.

Students calculate how long it takes for half of a radioactive element to break down, using a mathematical formula and simulated data. They learn what half-life means and practice reading decay graphs without handling any actual radioactive material.

Students calculate how gases mix and push on their surroundings using Dalton's law, then compare how fast different gases spread through a room versus escape through a tiny opening.

Reading the periodic table, students predict whether an element will be hard or soft, reactive or stable, and how it compares to its neighbors, using patterns in the table as a guide.

Students use the periodic table to figure out whether two elements will share electrons or transfer them, then explain what kind of bond forms and why.

Radioactive decay comes in three forms: alpha, beta, and gamma. Students learn how each one changes an atom's proton count and mass, then write equations showing that the numbers balance on both sides.

Students predict which elements will bond together by looking at how many electrons sit in the outermost layer of each atom. That pattern, repeated across the periodic table, explains why some elements react easily and others barely react at all.

Reading a chemical formula means knowing the rules behind it. Students learn to write the name and formula for compounds, including salts, acids, and molecules made of two nonmetals, using the international naming system chemists worldwide follow.

Students draw or diagram how splitting a heavy atom apart (fission) and fusing two light atoms together (fusion) both create entirely different elements. The model shows why each reaction releases enormous energy and changes the original atoms into something new.

Students use gas law equations and chemical equations together to calculate how much of a gas forms or reacts, at any temperature or pressure. The math explains why gases expand, shrink, or stay put under different conditions.

Students learn to use the periodic table to figure out how many atoms of each element combine when two elements form an ionic compound, then write the correct chemical formula.

When chemicals react, no atoms are created or destroyed. Students show this by balancing chemical equations so the same number of each atom appears on both sides.

Students run experiments to track how a radioactive material decays over time, measuring how long it takes for half of the sample to break down. That time span is the half-life.

Students use a more detailed version of the ideal gas equation to explain why real gases don't behave perfectly at high pressure or low temperature. The extra terms in the equation account for the actual size of gas molecules and the way they pull on each other.

When chemicals react, no atoms are created or destroyed. Students use models and balanced equations to show that the same atoms present before a reaction are all still there after it, just rearranged.

Students use the mole, a chemist's counting unit, to convert between the mass of a substance and the number of particles in a reaction. These calculations predict how much of each ingredient a reaction needs and how much product it will make.

Students learn why adding salt to water raises its boiling point and lowers its freezing point. They use two formulas to calculate exactly how much the temperature shifts based on how much solute is dissolved.

Students learn why a chemical reaction rarely produces as much product as expected. They practice identifying which ingredient runs out first and how that limits what the reaction can make.

Students learn how large biological molecules like proteins and DNA are built by chaining together smaller repeating units. They model how carbon's bonding flexibility makes this possible.

Students use pH strips, meters, or color-changing indicators to test a substance and classify it as an acid, a base, or neutral. Think vinegar versus baking soda dissolved in water, tested and sorted by where they fall on the pH scale.

Students name and sketch the ten simplest carbon-hydrogen chain molecules, then identify how swapping in groups like alcohols or acids changes how a molecule behaves.

Students look at what goes into a chemical reaction and use those starting materials to name the reaction type and predict what will come out.

Carbon atoms bond in ways no other element can, forming the backbone of plastics, fuels, medicines, and living things. Students study how carbon's structure makes those materials possible and how their use has shaped modern life.

Students explore how gases respond when pressure, volume, or temperature changes. They run experiments and build models to show why a sealed container heats up, a balloon shrinks in the cold, or a pump gets harder to press.

Students mix pairs of solutions in a lab and watch for cloudiness or solid chunks that form. From those patterns, they figure out which ions stay dissolved and which ones clump together, then write equations that show only the ions actually doing something.

Students learn why gases expand, compress, and push on their containers by studying how fast-moving molecules behave. They then use a formula connecting pressure, volume, and temperature to predict what happens when any one of those conditions changes.

Students learn to work with the Ideal Gas Law equation to calculate how pressure, volume, temperature, and the amount of a gas change together. If three of those four values are known, students can solve for the fourth.

In oxidation-reduction reactions, electrons move from one substance to another. Students identify which substance loses electrons and which gains them, balance these reactions in acidic or basic solutions, and connect that chemistry to how batteries and electrolytic cells work.

Students study how batteries store and release electricity by exploring the chemical reactions happening inside them. They look at real-world models of electrochemical cells and learn how those reactions power devices.

Students draw or diagram what happens when something dissolves in a liquid, showing which part is doing the dissolving and how much of it is present. The goal is to picture the mixing process at the particle level.

Students run a titration by slowly adding a known solution to an unknown acid or base until the reaction is complete, then use the measurements to calculate how concentrated the unknown is or how strong a weak acid or base is.

Students calculate how much of a substance is dissolved in a liquid, using three standard measures: molarity, percent composition, and parts per million. Each measure answers the same basic question in a different unit.

Students explain why and how chemical reactions happen, using both descriptions and numbers. That includes reactions inside living things, like how cells break down food for energy.

Students learn how to pull mixtures apart using heat, electrical charge, or color-separation techniques. Then they explain in writing why one method works better than another for a given situation.

Students draw or diagram an atom's inner parts, from the protons, neutrons, and electrons most people know down to the smaller particles (quarks and gluons) that make up protons and neutrons.

Students learn to recognize acids and bases by their shared properties, like how they react with other substances or change the color of an indicator. These aren't just chemistry categories; they're a distinct group of compounds with predictable, measurable behavior.

Students use diagrams and models to explain why some atoms are unstable and break apart, and how nuclear reactions like fusion and fission release energy by splitting or combining atomic nuclei.

Students compare three types of nuclear radiation by how heavy each particle is, whether it carries a charge, and how far it can travel through matter. They also look at where these radiation types show up in real life, from medical scans to smoke detectors.

Proteins do most of the work inside living cells, and DNA holds the instructions for building them. Students trace how a gene gets copied into RNA and then read like a recipe to assemble the right protein.

Students study how the body's structures, from cells to organs, are built to match what they do. The shape of a heart or lung isn't accidental; form and function go together.

Students design and run an experiment to show how the body keeps itself stable, like how sweating cools you down or how insulin keeps blood sugar in check. The investigation produces real evidence of how the body self-corrects when something shifts.

Students learn the major organ systems, what each one looks like, and what it does. Then they debate where one system ends and another begins, since systems like the nervous and endocrine often overlap in function.

Every cell in the body carries the same DNA, but cells develop into different types with different jobs. Students explain how muscle cells, nerve cells, and others each specialize to keep the whole organism working.

Students learn how the body is organized from cells to tissues to organs, and notice how certain cell and tissue types show up again and again across different organ systems.

Students model how plants use sunlight to convert water and carbon dioxide into sugar, storing that energy in chemical bonds. It's the process that powers nearly every living thing on Earth.

Students identify the major cavities of the human body and the organs inside each one, then describe their locations using the standard anatomical terms doctors and scientists use, such as which side is up, which is front, and how to slice the body into sections for study.

Food molecules get broken apart inside the body and reassembled into larger structures like proteins and DNA. Students explain, using evidence, how the raw materials from food become the building blocks cells need to grow and function.

Homeostasis is the body's way of keeping conditions like temperature and blood sugar stable. Students learn how the body senses a change through receptors and responds through effectors to bring things back into balance.

Cellular respiration is how cells break down food to release usable energy. Students model that process and compare it to fermentation, which does the same basic job without oxygen.

The brain takes in signals from the senses, processes them, and triggers a response. Students explain, using evidence, how those steps work together to produce behavior.

Students learn how skin, hair, and nails are built and what each part actually does, from blocking out pathogens to regulating body heat to sensing pain, pressure, and temperature.

Students draw a cross-section of skin showing its layers, from the outer surface down to deeper tissue, and label the cells and structures found at each level. They also trace how skin cells are made, move toward the surface, and eventually shed.

Students learn the names and locations of the major bones in the body, grouped into the central skeleton (skull, spine, ribs) and the limbs. They explain how each bone supports the body, shields organs, or gives muscles a place to pull from.

Students draw the internal structure of bone under a microscope, labeling the sections where blood cells are made and where the body stores calcium and fat.

Bone is living tissue that forms, grows, and heals throughout life. Students explain how cells build new bone, how bones lengthen during childhood, and how fractures repair themselves over time.

Students learn to tell apart the three types of muscle tissue by how each one looks under a microscope and what job it does, such as moving your arm, pumping blood, or pushing food through your digestive tract.

Students draw and label a skeletal muscle down to its microscopic parts, then use that model to explain how individual muscle fibers contract and why that process generates body heat.

Muscles work in opposing pairs to move bones at a joint. Students model how one muscle contracts while its partner relaxes, and trace where each muscle attaches to the skeleton.

Students trace the two loops blood takes through the body: one to the lungs to pick up oxygen, one to the rest of the body to deliver it. They connect how the heart's structure makes both loops work together.

Students build or examine a model of the heart to explain how it contracts and relaxes with each beat, and what signals, from nerves to internal pacemaker cells, keep that rhythm going.

Blood pressure measures the force blood puts on artery walls during each heartbeat. Students learn what happens when the heart contracts versus when it rests, and why factors like stress, salt, and fitness push that pressure higher or lower.

Blood is made of red cells, white cells, platelets, and plasma. Students learn what each part looks like at the cellular level and what job it does, from carrying oxygen to fighting infection to clotting a cut.

Students learn how oxygen moves from the lungs into the blood and how carbon dioxide travels back out. This covers how tiny blood vessels, red blood cells, and the natural pull between gas and blood make that exchange work.

Students learn how the skin, muscles, and heart work together to keep body temperature steady. When you overheat or get cold, these systems coordinate responses like sweating, shivering, and changes in blood flow to bring temperature back to normal.

The lymphatic system drains excess fluid from tissues and carries it back to the bloodstream. Students describe how each part, from lymph vessels to lymph nodes, is shaped to match what it does.

Innate immunity is the body's immediate, general response to any threat. Adaptive immunity is a slower but targeted response that learns to recognize specific invaders. Students distinguish between the two and name the immune cells involved in each.

Blood type is determined by proteins on red blood cells. Students learn how ABO and Rh blood groups affect whether a transfusion is safe and why certain mother-baby blood combinations can cause a dangerous immune reaction after birth.

Students trace how fats from a meal move out of the digestive system, travel through lymph vessels, and eventually enter the bloodstream. The path explains why fat absorption works differently than other nutrients.

Students trace food's path from mouth to intestine, naming each organ along the way and explaining what it does to break food down or move nutrients into the body.

Students examine the layered tissue of the intestinal wall under a microscope and explain how its structure moves digested nutrients into the bloodstream or lymph system.

Students learn which chemicals break food down in the digestive tract, where each one comes from, and what signals the body uses to control the process.

The hepatic portal system carries nutrients absorbed in the small intestine directly to the liver before they reach the rest of the bloodstream. Students explain how this pathway connects digestion to circulation.

Students trace the path urine takes through the kidneys, bladder, and out of the body, explaining how the blood gets filtered and waste gets removed along the way.

Students learn the parts of a nephron, the tiny filtering unit inside each kidney, and explain how each part helps the body balance water, salts, and waste by producing urine.

Students identify where the major hormone-producing glands sit in the body, name the hormones each one releases, and explain what those hormones actually do to other organs and tissues.

Students learn how hormones work as chemical messengers, matching specific receptors the way a key fits a lock. They also compare two types of hormones: those built from fat (steroids) that pass through cell walls, and those that work by knocking on the cell's surface.

Negative feedback is how the body keeps hormones at safe levels. When a hormone rises too high, the body senses it and dials production back down, the way a thermostat shuts off heat once a room warms up.

The central nervous system (brain and spinal cord) acts as the command center, while the peripheral nervous system is the branching network of nerves that carries signals to and from the rest of the body. Students explain how each system's location shapes what it does.

Students draw and label the parts of a nerve cell, then explain how electrical signals travel along it and jump the gap to the next cell using chemical messengers.

Sensory receptors are the cells and structures that detect what the body experiences. Students identify where each type sits in the body and what it picks up, from light hitting the eye to pressure on the skin.

Students learn how the nervous system splits into two branches: one they control on purpose (like moving a hand) and one that runs automatically (like keeping the heart beating).

Students map the major parts of the brain and spinal cord to the jobs they control, such as which region processes pain or keeps your heart rate steady.

The six human senses each rely on specific structures that detect signals and send them to the brain. Students explain how the ear, eye, skin, nose, and tongue work, what each one can and cannot do, and how the sense of balance tells the body where it is in space.

Students learn the names and jobs of the organs in the male and female reproductive systems, covering how sex cells form, how fertilization happens, and how a fertilized egg develops into an embryo.

Students examine egg and sperm cells under a microscope and explain how each cell's shape and parts help it do its job, such as how a sperm's tail drives it forward or how an egg stores the nutrients a fertilized cell needs to grow.

Hormones secreted by reproductive tissues control puberty changes, the monthly menstrual cycle, pregnancy, and birth. Students identify which glands and tissues release these hormones and explain what each one triggers.

Students follow the sequence of human development from a fertilized egg to a newborn, tracking when the heart, brain, and other organs form and begin to work.

Students explain why scientists think the universe is still expanding outward from the Big Bang. They use evidence like the stretched light coming from distant galaxies and what those galaxies are made of.

Students build scale models or diagrams that show how planets, stars, and galaxies relate to one another in space, using real astronomical distances to explain why some objects interact and others are too far apart to affect each other.

A star's mass determines how bright it burns, how hot it gets, and what happens when it dies. Students read data about stars and predict how each one changes from birth through its final stage.

Stars work like giant nuclear reactors, fusing hydrogen into helium and heavier elements. Students explain how most atoms in everyday matter, from carbon to iron, were forged inside stars or scattered by stellar explosions.

Students compare what different telescopes reveal about the same distant object, then weigh what each instrument does well and where it falls short. A radio telescope sees things an optical telescope misses, and that gap matters.

New telescopes and space instruments built over the past 30 years have reshaped what scientists know about galaxies, planets, and our place in the universe. Students learn how those discoveries also produced practical benefits here on Earth.

Students compare the sun, planets, moons, asteroids, and comets by examining their size, mass, gravity, and what they are made of. Reading data tables and charts, students explain what makes each type of object in the solar system distinct.

Students use math and simple models to predict how planets, moons, and comets move through space. They apply the rules of gravity and inertia to explain why objects orbit, speed up, slow down, or change course after a collision.

Students examine how gravity pulled dust and gas into a young planet while heat built up inside it, then design a simple research question to test one piece of that evidence.

Students examine data from meteorites, moon rocks, and planetary observations to piece together how Earth formed. Then they design a method to collect new data that could fill in the gaps.