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which describes simple diffusion?

solute molecules move across a cell membrane from areas of higher concentration to areas of lower concentration.

substances move across a cell membrane, a process that requires energy in the form of atp.

substances move across the cell membrane, a process that requires no energy.

water moves across a cell membrane in a manner that is dependent on the concentration of solutes.

The answer is "Solute molecules move across a cell membrane from areas of higher concentration to areas of lower concentration."

Explanation:

Simple diffusion specifically involves the movement of (small, uncharged) solutes across a cell membrane. Since diffusion is part of the passive transport umbrella, it also requires no energy since the solutes move down the concentration gradient - from areas of high concentration to areas of low concentration.

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