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Nearly all of the major kinds of life, divisions of life, phyla of animals, occur in the sea. Only about half of them can make it to land or freshwater.

"Its Budget Sunk, Undersea Lab May Have To Surface". "Science Friday" with Ira Flatow, www.npr.org. July 20, 2012.
Nearly all of the major kinds of life, divisions of life, phyla of animals, occur in the sea. Only about half of them can make it to land or freshwater.