Osmosis is the diffusion of water molecules down a concentration gradient through a semi-permeable membrane. Active transport is the movement of a substance against a concentration gradient.
Osmosis is the automatic net movement or diffusion of solvent molecules through a selectively-permeable membrane from a part of high water possibility (region of lower solute concentration) to parts of low water potential (region of higher solute concentration), in the order that tends to equalize the solute concentrations on the two sides.
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