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The principle characteristic distinguishing marine and freshwater ecosystems is _______. a. temperature b. presence of corals c. presence of fish d. dissolved salt
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The principle characteristic distinguishing marine and freshwater ecosystems is _______. a. temperature b. presence of corals c. presence of fish d. dissolved salt

User Joseph Dunn
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d.
hope this helps!!!

User DCTID
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The answer would be dissolved salt.  Its the presence of saltwater in marine and the absence of it in freshwater that makes the big difference.
User Eivind T
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