Across
- 2. We breath it in?
- 3. We need this to live?
- 5. the brain/function in a cell?
- 6. We breath is out?
- 7. You can put this in your tea/coffee?
- 8. Photosynthesis need this to work correctly?
- 9. Scientists only change one variable in a experiment?
Down
- 1. Helps plants to grow?
- 4. Causes heat in your body while you breath?
- 6. Is a green substance?