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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>.
Best Answer: Most of the sorts of protists found in fresh water have relatives found in the sea. Two extremly well known fresh water protists are the amoeba and the paramecium.Both are representative of the protist group to which they belong. The euglena is another common protist.It is half plant and half animal.wo extremly well known fresh water protists are the amoeba and the paramecium. Both are representative of the protist group to which they belong. The euglena is another common protist. It is half plant and half animal.