Biology for IGCSE & O level - Movement Into And Out Of Cells (Section 5 - No. 5)
Which of the following best describes diffusion?
The movement of molecules from an area of low concentration to an area of high concentration.
The movement of molecules from an area of high concentration to an area of low concentration.
The movement of molecules across a semi-permeable membrane.
The movement of water molecules from an area of low solute concentration to an area of high solute concentration.
Explanation
Diffusion is the net movement of molecules from a region of higher concentration to a region of lower concentration.
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