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Respiratory structures of two different ...

Respiratory structures of two different animals-a fish and a human being are as shown.
Observe (a) and (b) and select one characteristic that holds true for both of them.

A

Both are placed internally in the body of animal.

B

Both have thin and moist surface for gaseous exchange.

C

Both are poorly supplied withblood vessels to conserve energy.

D

In both the blood returns to the heart after being oxygenated.

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