Biology for IGCSE & O level - Movement Into And Out Of Cells (Section 2 - No. 41)
Which of the following statements about diffusion is true?
Diffusion always requires energy.
Diffusion only occurs in liquids.
Diffusion is a passive process.
Diffusion moves molecules against a concentration gradient.
Explanation
Diffusion is a passive process, meaning it doesn't require energy and moves molecules down their concentration gradient.
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