Why Freshwater ecosystem and Marine ecosystem are similar

Sentences that refer to both

Sentences that refer to both
  and 

  • Ecosystems are broadly categorized as terrestrial, freshwater, atmospheric, or marine.Ecology-Wikipedia
  • DOC is abundant in marine and freshwater systems and is one of the greatest cycled reservoirs of organic matter on Earth, accounting for the same amount of carbon as in the atmosphere and up to 20% of all organic carbon.Dissolved organic carbon-Wikipedia

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