Question

what is the main function of the cell membrane in an animal cell?
to break down sugar and release energy that the cell can use
to contain the information that the cell uses for growth and activities
to make proteins
to control which substances enter and leave the cell

Explanation:

The cell membrane is a semi - permeable membrane. It has the property of selective permeability. This means it can regulate the movement of substances. Substances like nutrients (e.g., glucose, amino acids) need to enter the cell, and waste products (e.g., carbon dioxide) need to leave the cell. The cell membrane controls this movement.
Breaking down sugar to release energy is the function of mitochondria (cellular respiration). Containing information for growth and activities is the role of DNA (in the nucleus). Making proteins is the function of ribosomes.

Answer:

to control which substances enter and leave the cell