Biology

The correct answer is: C.When equilibrium is reached.

Diffusion in cells occurs as molecules move from an area of higher concentration to an area of lower concentration, aiming to achieve a state of equilibrium, where the concentrations on both sides of the membrane are equal. Once equilibrium is reached, there is no net movement of molecules because the concentration is the same on both sides, though individual molecules still move randomly.

To clarify the other options:

A.When vesicles burst: This does not stop diffusion. It would typically refer to a different process, like cell injury or vesicular transport, which is not directly related to the diffusion process itself.

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