Question

what is the main function of the cell membrane in an animal cell?
to make proteins
to pull replicated chromosomes apart during cell division
to break down waste and worn - out cell parts
to control which substances enter and leave the cell

Explanation:

The cell membrane is a selectively permeable barrier. It regulates the movement of substances (such as ions, nutrients, and waste) in and out of the cell. Ribosomes are involved in protein - making. Microtubules pull replicated chromosomes apart during cell division. Lysosomes break down waste and worn - out cell parts.

Answer:

to control which substances enter and leave the cell