Biology

The correct answer is: C.Cell membrane

The cell membrane (also known as the plasma membrane) plays a crucial role in maintaining homeostasis by regulating the movement of substances into and out of the cell. It acts as a selective barrier, allowing essential molecules (like nutrients and oxygen) to enter the cell and waste products to be expelled, while preventing harmful substances from entering. This selective permeability is facilitated by the structure of the membrane, which includes phospholipids, proteins, and other molecules that help control transport through the membrane.

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