Fick's law of diffusion states that the rate of diffusion across a membrane is
A) proportional to surface area and membrane thickness, but inversely proportional to concentration gradient.
B) proportional to membrane permeability, but inversely proportional to concentration gradient and surface area.
C) proportional to concentration gradient, surface area, and membrane permeability.
D) proportional to membrane thickness and surface area.
C) proportional to concentration gradient, surface area, and membrane permeability.
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