Q.

In which one of the following animals, is skin a respiratory organ?

A. Cockroach
B. Frog
C. Shark
D. Whale
Answer» B. Frog
Explanation: Frog skin is water permeable, this means it can let water in and out. Frogs don't often drink with their mouths, they absorb water through their skin.
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Biology (GK)

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