Across
- 1. carbon dioxide is ???
- 5. You get oxygen by ???
- 6. oxygen is ???
- 7. Tiny air sacs in your lungs
- 9. Major organs of the respiratory system are the ???
- 10. The air you breathe is filtered by hairs in your ???
Down
- 2. carbon ??? is a waste product
- 3. Your body uses a lot of ???
- 4. Your windpipe is your ???
- 8. Your cells need a lot of food and ???