Biology

The correct answer is: D.All of the above

Explanation:

The cell membrane plays a crucial role in maintaining homeostasis by controlling what enters and exits the cell. Here's how each option contributes:

A.By allowing fluid movement of the membrane: The cell membrane is fluid due to its lipid bilayer structure, which allows for the movement of lipids and proteins. This flexibility helps the cell respond to changes in the environment, contributing to its ability to maintain homeostasis.

B.By regulating the transport of ions: The membrane has specific ion channels and transporters that control the movement of ions (such as sodium,...