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fgiga [73]
3 years ago
5

HELP!!

Biology
2 answers:
Dimas [21]3 years ago
8 0

Answer:

the awnser is a

Explanation:

I took the quiz

Vaselesa [24]3 years ago
4 0

Answer:

the answer is a i hope this helps

Explanation:

The sac-like structure of the alveoli increases their surface area. In addition, the alveoli are made of thin-walled parenchymal cells. These features allow gases to easily diffuse across the cells. so the

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