## Encyclopedia > Zooplankton

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# Plankton

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Plankton is the name given to all the microorganisms that drift and hover in the ocean and freshwater. The name comes from the Greek language $\pi\lambda\alpha\gamma\kappa\tau o\nu$ - term for "wanderer" or "drifter". If the organism has a method of propulsion, it is instead called nekton.

Plankton are divided into two classes:

Plankton concentration and distribution is very sensitive to chemical and physical changes in the sea water.

 See also larger images (http://www.ecoscope.com/ocean/index.htm); (photomontage by Uwe Kils) Hyperiid amphipod, Hyperia macrocephala (http://www.ecoscope.com/hyperia/index.htm) (Uwe Kils) Copepod (Calanoida) (Uwe Kils)

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