Across
- 2. What do we breathe out?
- 5. What wall does the oxygen and carbon dioxide push through?
- 7. any process that living things use to actively maintain fairly stable conditions necessary for survival
- 8. What organ is most vital to the respiratory system?
Down
- 1. What is the meeting point for the nose and mouth called?
- 2. What is the "Nose hair" that protects you from breathing anything unwanted in?
- 3. What do we breathe in?
- 4. What is another word for throat?
- 6. Tiny air sacks