How does the cell membrane in the diagram maintain homeostasis in this cell?

The correct answer is **B. By regulating the transport of materials in and out of the cell**.

The cell membrane, also known as the plasma membrane, plays a critical role in maintaining homeostasis by controlling the movement of substances into and out of the cell. It is selectively permeable, allowing certain molecules to pass while restricting others, ensuring that essential nutrients enter the cell, waste products are expelled, and the internal environment remains stable.