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The contractile vacuole allows free-living protists to expel extra water. <b>The contractile vacuole allows free-living protists to expel extra water <br /></b>.
The nucleus contains the genetic material. The contractile vacuole is used to regulate the amount of water in the cell, and this important organ can absorb water from the cytoplasm and expel it from the cell via the membrane. Food vacuoles are used to store and digest food that the amoeba has absorbed.