allows some things to enter and leave cells, while keeping other things in the cell or keep other things out of the cell.

A:fermentation

B:A selectively permeable membrane

C:metabolism

D:osmosis

The cell membrane is the outer layer of the cell. The primary function of the cell membrane is to regulate what substances enter and leave the cell. The cell membrane is selectively permeable, or "semi-permeable", meaning that the membrane only allows certain substances to enter or leave the cel

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