7. The cell membrane serves many functions. One of the cell membrane's functions is to help the cell maintain homeostasis. Which of the following statements best supports this claim?
a. The cell membrane contains a polar region and a nonpolar region.
b. The cell membrane contains proteins.
c. The cell membrane contains phospholipids.
d. The cell membrane regulates what goes in and out of the cell.

The correct answer is - d. The cell membrane regulates what goes in and out of the cell.

Explanation:

The cell membranes are the organelle that surrounds the cell and acts as a barrier for the cell that plays various roles in the cell including regulation of the substances and matter moves in and out of the cell.

This function of allowing selective substances and ions to enter and exit the cell helps to maintain the homeostasis of the cell. This ability is comes from the structure of the cell membrane which is the bilipid membrane.