Answers

2015-07-12T13:14:16+08:00
Alveoli, also called airsacs: allows the gas exchange in lungs.
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2015-07-12T13:35:09+08:00
The main stem as the trachea,the large branching stems as the bronchi,and at the little stems as the bronchioles.the individual  grapes are the airsacs or alveoli..

I hope this answer helps you a lot ;)
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