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Plankton is the base of the marine and fresh-water food web. Phytoplankton are the major way in which sunlight and CO2 is converted to organic molecules, and hence supports life in the ocean and fresh water. Plankton are also responsible for sequestering many elements in the Earth's crust. Carbon, for example, is sequestered when the dead plankton drift down to the sea floor and are buried, finally being subducted under the crust and crushed into limestone or metamorphosed into other rocks.

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15y ago

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