Biology

The correct answer is: C.ATP

Explanation:

Active transport requires ATP (adenosine triphosphate) to work because it involves the movement of substances against their concentration gradient (from low to high concentration). This process requires energy, and ATP provides that energy.

ATP is used by transport proteins (such as pumps) to move ions or molecules across the cell membrane, often through mechanisms like the sodium-potassium pump or endocytosis and exocytosis.

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