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The contractile vacuole allows free-living protists to expel extra water. <b>The contractile vacuole allows free-living protists to expel extra water <br /></b>.
Prawns have green glands for excretion and vertebrates have kidneys as their excretory organ. The role of excretory organ is to remove unwanted wastes and regulate the water content in body and is known as Osmoregulation. Animals are classified on the basis of type of removal of nitrogenous waste.