Answer:
The lipids and proteins that make up the membrane allow it to be selective about what enters and leaves the cell.
Step-by-step explanation:
The cell membrane is a biological membrane that separates the interior of cells from the environment outside of it. This protects the cell from the environment outside of it. It also plays an important role in what gets in and out of the cell. As the membrane is made up of lipids and proteins, it is able to control the movement of substances in and out of cells and organelles.