Gas exchange requires a surface that is both ______.
A) ciliated and flagellated
B) protected within the body and connected to the circulatory system
C) thin and moist
D) permeable to oxygen and impermeable to carbon dioxide

Question

Quizplus · Accepted Answer

To allow for gas exchange, the surface needs to be thin to allow for easy diffusion of gases across it, and moist to help dissolve gases and prevent drying out.

Gas Exchange Requires a Surface That Is Both ______