Across
- 3. information about the world
- 4. the body's use of molecules
- 5. the ability to make things move
- 6. a type of energy source
- 9. a gas humans breathe in
- 10. a system that takes in food
- 11. a set of parts that work together
- 16. a chemical reaction
- 18. a gas humans breathe out
- 19. a molecule you need to survive
Down
- 1. body system that circulate molecules
- 2. atoms rearrange to form new things
- 7. the body system that takes in air
- 8. a claim that is supported
- 12. a group of atoms joined together
- 13. a molecule that gives energy
- 14. a proposed answer to a problem
- 15. molecules that build protein
- 17. the process of clear evidence