Final answer:
Osmosis is the diffusion of water through a semipermeable membrane. It differs from diffusion as it specifically transports only water across a membrane and limits the diffusion of solutes. An example of osmosis is seen in red blood cells.
Explanation:
Osmosis is the diffusion of water through a semipermeable membrane according to the concentration gradient of water across the membrane, while diffusion transports various materials across membranes and within cells. Although similar in the movement of molecules, osmosis specifically transports only water across a membrane, with the membrane restricting the diffusion of solutes in the water.
One real example where osmosis takes place is in red blood cells. When placed in a hypertonic solution with a higher solute concentration outside the cell, water moves out of the cell through osmosis, causing the cell to shrink.
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