Question

select the part whose main job is to control which substances enter and leave the cell. cell membrane endoplasmic reticulum ribosome vacuole

Explanation:

The cell membrane is a selectively - permeable barrier. It regulates the movement of substances in and out of the cell. The endoplasmic reticulum is involved in protein and lipid synthesis. Ribosomes are sites of protein synthesis. Vacuoles are mainly for storage.

Answer:

cell membrane