In order to survive in its environment, a single-celled organism uses a contractile
vacuole to...
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.
Answers: 1
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