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B
Storage
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C
Osmoregulation
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D
Circulation
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Solution
The correct option is B Osmoregulation Contractile vacuoles are present in protozoans, sponges and hydras. These vacuoles are capable of expelling excess of water from inside of the cells to the external medium. They are also responsible for expelling the nitrogenous waste, specifically the ammonium ions. So, these help in maintaining the osmoregulation in the lower animals.