How would the contractile vacuole of a freshwater amoeba respond if the organism was placed in seawater?

In freshwater, water continually enters an amoeba by osmosis, so its contractile vacuole pumps out the excess. Seawater is saltier than the amoeba’s cytoplasm, so less water enters—and water may even leave the cell. The vacuole therefore has less excess water to remove and contracts less often. The correct choice is “with fewer contractions.”

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