What is the main function of gas exchange A) To remove carbon dioxide and supply oxygen to
the body
B) To remove oxygen from the body
C) To supply carbon dioxide and remove oxygen
from the body
D) To supply water to the body cells

A.

Explanation:

We exhale carbon dioxide and inhale oxygen.

Gas exchange allows the body to replenish the oxygen and eliminate the carbon dioxide So the answer is A

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.