Answer: Yes, they do in order to live they must change materials with the environments Support: 21.5 Balance with External Environments All organisms must exchange materials with the environment to live Both essential and unnecessary materials may pass into on organisms from its surrounding Freshwater organisms, life all other organisms, require water in their bodies To maintain homeostasis, freshwater organisms must eliminate the excess water without losing significant quantities of soluble body salts, or electrolytes Saltwater fishes and some marine invertebrates have a p...

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