What is the function of the cell membrane? (4 points) to add structure and support to the shape of the cell to control what substances enter and leave the cell to monitor the amount of glucose needed by the cell to prevent waste from entering and leaving the cell

To control what substances enter and leave the cell

Explanation:

The cell membrane controls the movement of substances in and out of cells and organelles. In this way, it is selectively permeable to ions and organic molecules.

there is none because earth is stationary and flat.