Across
- 2. makes ATP energy
- 4. wall outer layer of a planet cell
- 8. gas exchange
- 9. air
- 11. has meteors
- 12. explains why
- 13. responsible for movement
- 14. found in the immune system
- 17. repeating an experiment multiple times
- 18. where planes fly
- 19. holds the DNA
Down
- 1. variable that you change
- 3. frozen water
- 5. long period of time weather
- 6. makes proteins
- 7. where we live
- 10. water
- 14. changes rapidly
- 15. break down food into nutrients
- 16. part of the nervous system