Gases like oxygen and carbon dioxide move across cell membranes
a. endocytosis
b. ion channels
c. diffusion
d. facilitated diffusion

Gases, like oxygen and carbon dioxide, move across cell membranes using simple diffusion. When ions can pass through the membrane without the aid of other molecules, and since oxygen and carbon dioxide can pass through the membrane, it is known as simple diffusion.

The correct answer is:       [c]:   "organisms that are sensitive to changes in temperature would die. "