QuestionAugust 23, 2025

Which statement about diffusion is true? A. Energy is required for molecules to move across a membrane. B. Diffusion happens when molecules move from a low concentration to a high concentration C. Diffusion happens when molecules move from a high concentration to a low concentration. D. During diffusion, molecules move only in one direction.

Which statement about diffusion is true? A. Energy is required for molecules to move across a membrane. B. Diffusion happens when molecules move from a low concentration to a high concentration C. Diffusion happens when molecules move from a high concentration to a low concentration. D. During diffusion, molecules move only in one direction.
Which statement about diffusion is true? A. Energy is required for molecules to move across a membrane. B. Diffusion happens when molecules move from a low concentration to a high concentration C. Diffusion happens when molecules move from a high concentration to a low concentration. D. During diffusion, molecules move only in one direction.

Solution
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Answer

C. Diffusion happens when molecules move from a high concentration to a low concentration. Explanation 1. Identify the definition of diffusion Diffusion is the movement of molecules from an area of high concentration to an area of low concentration. 2. Evaluate each statement A. Incorrect, as diffusion does not require energy. B. Incorrect, as it describes active transport, not diffusion. C. Correct, as it matches the definition of diffusion. D. Incorrect, as molecules move randomly in all directions during diffusion.

Explanation

1. Identify the definition of diffusion<br /> Diffusion is the movement of molecules from an area of high concentration to an area of low concentration.<br /><br />2. Evaluate each statement<br /> A. Incorrect, as diffusion does not require energy.<br /> B. Incorrect, as it describes active transport, not diffusion.<br /> C. Correct, as it matches the definition of diffusion.<br /> D. Incorrect, as molecules move randomly in all directions during diffusion.
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