Question

the cell membrane is a flexible outer layer that protects the cell. it controls what goes in and out through selective permeability, and helps the cell communicate with other cells. selective permeability means the cell membrane chooses what can enter or leave, keeping the cell healthy. passive transport: molecules move naturally from areas of high concentration to low concentration without using energy. osmosis: a type of passive transport where water moves across the membrane to balance water levels. active transport: molecules are moved against their concentration gradient using energy (atp). selective permeability means: the cell chooses what to let in and out. anything can enter the cell. only harmful things enter the cell.

Explanation:

Selective permeability of the cell - membrane means it has the ability to control the movement of substances in and out of the cell. It chooses what can enter or leave, protecting the cell and maintaining its health. It does not allow just anything to enter (ruling out "anything can enter the cell") and is not a mechanism for only letting harmful things in (ruling out "only harmful things enter the cell").

Answer:

the cell chooses what to let in and out.