Question

multiple choice question
during diffusion, molecules move from an area of ____ concentration to an area of ____ concentration.

lower; higher

higher; lower

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Explanation:

Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration, driven by the natural tendency to achieve equilibrium. So the correct pair is higher to lower.

Answer:

B. higher; lower (assuming the second option is labeled B, if the first option was A and the second B, with the second option being "higher; lower")