Diffusion is: A. the movement of a substance across a membrane. B. the movement of a substance by osmosis. C. the movement of substances from an area of low concentration to an area of high concentration. D. the tendency of molecules to move in space due to kinetic energy.

a.

Explanation:

Movement of things from a region of high concentration to a region of low concentration through semi-permeable membrane is refereed to as diffusion.

There are two types of diffusion:

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