The difference between osmosis and diffusion is that osmosis is the spreading of water from a high to low concentration while diffusion is the spreading of molecules or particles from a high to low concentration.
Biology · High School · Wed Jan 13 2021
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Osmosis only allows solvent molecules to move freely, but diffusion allows both solvent and solute molecules to move freely. Osmosis happens when molecules move from higher to lower concentrations, but diffusion happens when it is reversed.