The kidneys resemble the contractile vacuoles of protozoans in

Expelling out excess of water

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Expelling out glucose

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Expelling out urea and uric acid

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Expelling out salts

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Solution

The correct option is A Expelling out excess of water
Some protozoan animals possess an organelle having the form of an internal sac or vacuole, which enlarges by the accumulation of a clear fluid and then discharges its contents to the exterior. The chief role of the contractile vacuole is osmotic regulation, not nitrogen excretion.

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