1
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We breathe and the air goes to the mouth and nose. The air goes down for the language and dragon. Then the air goes to the bronchus. In the bronchus, the air goes to the bronchus.

2
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Then the air goes into the air trucks. In the air trucks, the gas exchange happens.

3
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We absorb the oxygen and expel the CO2, and the CO2 goes up and they re-expel.