Question

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

Explanation:

The cell membrane is a selectively - permeable barrier. Its main function is to regulate the movement of substances in and out of the cell. The endoplasmic reticulum is involved in protein and lipid synthesis, the vacuole stores substances and helps with cell turgor, and mitochondria are the power - houses of the cell for energy production.

Answer:

cell membrane