Across
- 1. the passage that air takes into and out of the body
- 3. the gas that forms as our body uses oxygen, poisonous, CO2
- 6. breathing tube located in the neck
Down
- 1. tiny air sacks that branch out, allowing for gas exchange
- 2. the site of gas exchange
- 4. how air enters and exits our body
- 5. the gas that provides our body with energy, O2