Osmosis does not occur if there is no concentration gradients for water and solutes on opposite sides of a semipermeable membrane.

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Osmosis is the movement of water across a semipermeable membrane from an area of high water concentration to an area of low water concentration. This movement is driven by the concentration gradient of water molecules. If there is no concentration gradient for water and solutes on opposite sides of a semipermeable membrane, osmosis will not occur.

Osmosis Does Not Occur If There Is No Concentration Gradients