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(B) Freshwater protozoans like $Amoeba$ possess a contractile vacuole to perform osmoregulation,which involves expelling excess water that enters the

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Disappear

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(B) Freshwater protozoans like $Amoeba$ possess a contractile vacuole to perform osmoregulation,which involves expelling excess water that enters the cell due to the hypotonic environment.When placed in seawater,which is a hypertonic solution,the external environment has a higher solute concentration than the cytoplasm of the protozoan.Due to exosmosis,water moves out of the cell into the surrounding seawater.As a result,there is no excess water to be expelled,and the contractile vacuole,which functions to remove water,becomes inactive and eventually disappears.

When a freshwater protozoan possessing a contractile vacuole is placed in a glass containing seawater,the vacuole will:

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