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Finger [1]
3 years ago
11

Can someone please help me!

Biology
1 answer:
kkurt [141]3 years ago
5 0
The answer is C.

It is the site of gas exchange in the lungs.

Gas exchange occurs only in alveoli. Alveoli are made of thin-walled parenchymal cells, typically one-cell thick, that look like tiny bubbles within the sacs. Alveoli are in direct contact with capillaries (one-cell thick) of the circulatory system.
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Please find the explanation below

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Help!!!!! Please answer all of them, no explanation needed!!! <3
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I hope this helps. 

Have a nice day. :) 
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