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Answer :

2morrowklgo

Answer:

Thin walls consisting of a single layer of epithelial cells narrow about as wide as one red blood cell, and increase the surface area for gas and fluid exchange.

Explanation:

RumColingo

Answer:            Capillaries

Explanation:

I just got it correct on my test. (I was trying to send a attachment photo for proof and it about crashed my pc). Trust me.

BRAINLIEST PLEASEEE!!

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