Question: 2) Use the model a few times to demonstrate the process of ventilation. Hopefully you see the ung expand and fill with air, even slightly.

 2) Use the model a few times to demonstrate the process

2) Use the model a few times to demonstrate the process of ventilation. Hopefully you see the ung expand and fill with air, even slightly. (If you don't, check that everything on your model is airtight and try again.) Why does this happen

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