Biology

The correct answer is: C.Cell Membrane

Explanation:

The cell membrane is considered the "gatekeeper" of both plant and animal cells. It controls the movement of substances into and out of the cell, ensuring that essential materials (such as nutrients and oxygen) can enter, while waste products (such as carbon dioxide) are removed. The cell membrane is selectively permeable, allowing it to regulate which substances can pass through.

Why the other options are incorrect:

A.Cell Wall: While the cell wall provides structural support and protection in plant cells (and some other ...