Across
- 4. Harmful materials that damage air, water, or land.
- 5. – A huge collection of stars, gas, and dust.
- 6. Cutting down too many trees in a forest.
- 8. A giant ball of hot gas that gives off light and heat.
- 10. Turning used materials into something new.
- 11. The path one object takes around another in space.
- 12. A package of DNA found in cells.
- 14. The variety of living things in an area.
- 15. A large body that orbits a star, like Earth.
- 17. A resource that can be replaced naturally (like wind or trees).
- 18. A change in DNA that can cause differences in traits.
- 19. The molecule that carries instructions for traits in living things.
Down
- 1. A characteristic, like eye color or height.
- 2. A section of DNA that controls one trait.
- 3. Protecting and saving natural resources.
- 5. The genetic code (letters) that an organism has.
- 7. The physical appearance of a trait.
- 9. A community of living things and their environment.
- 13. Passing traits from parents to children.
- 16. A rocky object that orbits the sun, smaller than a planet.