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(D) Fresh-water protozoans (like $Amoeba$) live in a hypotonic environment,where water constantly enters their body via osmosis. The contractile vacuo

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Disappear

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(D) Fresh-water protozoans (like $Amoeba$) live in a hypotonic environment,where water constantly enters their body via osmosis. The contractile vacuole functions to expel this excess water to maintain osmotic balance.When placed in marine water (a hypertonic environment),the external medium has a higher solute concentration than the cytoplasm of the protozoan.Consequently,water moves out of the protozoan's body into the surrounding medium due to exosmosis.Since there is no excess water entering the cell,the contractile vacuole is no longer required to function and eventually disappears.

When a fresh-water protozoan possessing a contractile vacuole is placed in a glass containing marine water,the vacuole will

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