Question

diffusion is most useful when... cells need something that can fit through the cell membrane, and they have less of it than their outside environment. cells need something that can fit through the cell membrane, and they have more of it than their outside environment. cells need something that cannot fit through the cell membrane, and they have less of it than their outside environment. cells need something that cannot fit through the cell membrane, and they have more of it than their

Explanation:

Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. For diffusion to occur, the molecules must be able to pass through the cell membrane (so they can move). And the direction is from where there is more (outside environment) to where there is less (inside the cell, as the cell "needs" it, meaning it has less initially).

Answer:

cells need something that can fit through the cell membrane, and they have less of it than their outside environment.