Across
- 3. tiny air-sacks at the end of the respiratory system
- 5. dioxide molecule that you breathe out
- 6. were you breath from and has teeth inside
- 7. makes the food not go in the respiratory system
- 9. where you breath from in the middle of your face
Down
- 1. filter for the respiratory system
- 2. what connects your nose and mouth to your lungs
- 4. organ that helps you breath
- 8. molecules that come from tress