Osmosis: is the movement of water from a dilute solution to a more concentarated solution, through a partially permeable membrane. the membrane allows the water molecules through but not the solute molecules, because they are too large. The effect of osmosis is to gradually dilute the solution.
Diffusion: is the spreading of the particles of a gas, or of any substance in solution, which results in a net movement from a region where they are at a higher concentration to a region where they are at a lower concentration. For example, Oxygen required for respiration passes through all membranes by diffusion.
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