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human anatomy
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For more on marking an answer as the "Best Answer", please visit our FAQ.Hi Katrina
If you know what osmosis means then you should be able to think about where that feature might be useful in the human body.
Osmosis is the movement of particles from an area of high concentration to an area of low concentration via a semi-permeable membrane.
Probably the most obvious example of this in the human body would be in the kidney/bladder region, although there are many areas in the body where osmosis is required for function. If I tell you any more I'd be doing your homework for you!
Good luck
Back again. Ursula62 was right about your home work. So what follows is not about human body example (quite interesting, though).
In the example of the fresh water fish placed in the ocean, the water in the fish has a lower salt concentration than the surrounding ocean. The water in the fish moves through the semi permeable membrane (the cells of the living fish) from the area of low salt concentration (the fish) to the area of high salt concentration (the ocean). As a result, the fish dies of dehydration while surrounded by water.