4. many fresh-water one-celled organisms have structures called contractile vacuoles. these
structures collect and pump out excess water that accumulates in the cell. name the process that
causes water to flow into these organisms.
explain why contractile
vacuoles would be of little value to one-celled organisms living in the ocean (salt water).
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4. many fresh-water one-celled organisms have structures called contractile vacuoles. these
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