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Osmosis: the movement of water molecules from an area of high concentration to an area of low concentration.
Cell membranes are completely permeable to water, therefore, the environment the cell is exposed to can have a dramatic effect on the cell.
OSMOSIS
Watch this animation of water molecules moving across a selectively permeable membrane. Water molecules are the small blue shapes, and the solute is the green.
The solute is more concentrated on the right side to start with, which causes molecules to move across the membrane toward the left until equilibrium is reached.