A marine ecosystem is where there is more salt water than fresh water involved in the balance of the landscape. Other aquatic ecosystems are fresh water lakes, rivers and estuaries. The marine ecosystem includes all life forms and land forms that might occur in each location.
Marine ecosystem topography can include tidal zones, coral reefs, river mouths, estuaries and reefs where salt water is predominant. The life forms that live in the marine ecosystem will be adapted to life in a salty environment.
Even tropical marine ecosystems will have similar conditions as underlying criteria for classification. The levels of salt water will effect the life forms able to exist in the symbiotic relationships needed between marine ecosystem and sustainable life.
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