Question

Why should the respiratory surface of earthworms be moist?

Answer 1

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.

Answer 2

Answer:

Earthworms come on land after the rain:- so that they can move over land.The temporarily wet conditions give worms a chance to move safely to new places.**Since worms breathe through their skin, the skin must stay wet in order for the Oxygen to pass through it.** So it gives them an opportunity to move greater distances across the soil than they could do through soil. Hope it will be helpful.

Explanation: