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.
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A. flavor of an apple from a particular tree
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edge
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He used peas because they are self pollinating,they grow fast,and they have many traits
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probably spraying or dusting the plants
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