What is osmosis and it's functions

Osmosis is a passing of material and especially water through a membrane (as of a living cell) that will not allow all kinds of molecules to pass. Osmosis allows water to pass through cell membranes. The transfer of water from a dilute solution to a concentrated solution over a partly permeable membrane is defined as osmosis.

Explanation:

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i do not get it   at all

what is the question here. i think you messed up.