In order to survive in its environment, a single-celled organism uses a contractile
vacuole to...
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In order to survive in its environment, a single-celled organism uses a contractile
vacuole to remove excess water that diffuses into its cell. Another species, a hydra,
also excretes excess water. Both processes involve the use of energy.
Based on this information, state whether these two organisms live in fresh water or
salt water. Support your answer.
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Answers: 1
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