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71% of the earth’s surface is covered by marine ecosystems. Marine ecosystems can be divided into many zones depending upon water depth and shoreline. They cover approx. 71% of the earth’s surface and contain 97% of the planet’s water.
0.80% of the earth’s surface is covered by freshwater ecosystems. Fresh water ecosystems contain 41% of the world’s known fish species. It covers 0.80% of the earth’s water and inhabit 0.009 % of its total water.
85% of sea water contains salts like sodium and chlorine. The total gram weight of dissolved substances in one kg of seawater in called sailinity.These dissolved compounds effect species composition of particular marine habitats.
1/3 of marine ecosystem is occupied by coastal habitats. Marine ecosystems like coral reefs provide shelter to most of the marine diversity in the world. The term coral refers to a number of animals like the soft corals, hard corals, whip corals, sea pens and organ pipe. Coral is known to exist since 200 million years in the marine ecosystems.