Question

Respiratory surface of animals must be moist. Why?​

Answer 1

Large animals cannot maintain gas exchange by diffusion across their outer surface. ... Those gases can only cross cell membranes when they are dissolved in water or an aqueous solution, thus respiratory surfaces must be moist.

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Answer 2

Answer:

A respiratory surface is covered with thin, moist epithelial cells that allow oxygen and carbon dioxide to exchange. Those gases can only cross cell membranes when they are dissolved in water or an aqueous solution, thus respiratory surfaces must be moist