Marine protozoans lack a contractile vacuole | vedclass

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(C) The primary function of a contractile vacuole is osmoregulation,specifically the removal of excess water that enters the cell via osmosis in fresh

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They are isotonic with their environment

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(C) The primary function of a contractile vacuole is osmoregulation,specifically the removal of excess water that enters the cell via osmosis in freshwater environments. Marine protozoans live in a saline environment that is generally isotonic to their internal cellular fluids. Since there is no net influx of water into the cell,there is no requirement for an active water-expelling organelle like a contractile vacuole.

Marine protozoans lack a contractile vacuole because:

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