Biology

The correct answer is: B.cell membrane

Explanation:

The cell membrane (also known as the plasma membrane) is present in both plant and animal cells. It serves as a barrier between the cell's internal environment and the outside world, regulating the movement of substances in and out of the cell. This selective permeability allows the cell to maintain homeostasis by controlling what enters and exits, such as nutrients, waste products, and ions.

Why the other options are incorrect:

A.Cell wall: Found in plant cells, fungi, and some bacteria, the cell...