Answer: Option B
Explanation:
The cell membrane is the outer most layer of the cell. The cell surface helsp in the movement of the particles from inside to outside of the cell and vice versa.
The larger particles that needs energy is also moved inside the cell with the help of energy and the particles that move by the help of diffusion is also moved via cell membrane.
It can be said so that the regulation of the transport of materials from in and out of the cell.
