The fluid inside a cell is cytoplasm
A contractile vacuole works just the same as the name suggests, in that it expands and contracts. The point of the contractile vacuole is to pump water out of the cell through a process called osmoregulation, the regulation of osmotic pressure. It occurs in freshwater protists, but mainly in the kingdom Protista as a whole.
A<span>utotrophs differ from heterotrophs in that only autotrophs can make their own food
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