diffusion is the movement of a substance?
A.only through a lipid bilayer membrane
B.from an area of low concentration to an area of higher concentration
C.only in liquids
D.from an area of high concentration to an area of lower concentration
Diffusion also happens for gases, so it is not C. Diffusion does not require energy, so it is not B. It cannot be A as diffusion can happen through other membranes, I think? Therefore, it is D.
