Across
- 3. the structure where a plant makes food
- 6. a gas found in air and water that animals need to survive
- 8. substances that help living things grow and stay healthy
- 13. a structure that holds up a plant
- 14. animals that spend part of their lives in water and part on land
- 16. a gas plants use with sunlight and water to make food
- 17. a substance inside a plant's cells that gives leaves their green color
- 20. a kind of animal with a beak, feathers, two wings, and two legs
- 21. to make more of one's own kind
- 23. an animal with a backbone
- 24. a safe place for an animal to live
- 26. react
Down
- 1. a living thing
- 2. the process through which plants make food
- 4. a thin, hard outer covering
- 5. vertebrates that spend their whole lives in water and breathe using gills
- 7. structures that take in oxygen from the air
- 9. an animal that does not have a backbone
- 10. all the living and nonliving things that surround an organism
- 11. a tool that makes tiny things look larger
- 12. vertebrates with hair or fur
- 15. structures that take in oxygen from the water
- 18. vertebrates with scaly skin
- 19. parts
- 22. the basic building block that makes up all living things
- 25. plant structures that take in water and hold the plant in place