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Parameter Tree:
EARTH SCIENCE > BIOSPHERE > AQUATIC ECOSYSTEMS > PLANKTON > ZOOPLANKTON
Definition:
Zooplankton is the animal portion of the plankton; the animal community
in marine and freshwater situations that floats free in the water,
independent of the shore and the bottom, moving passively with the
currents. 
Reference:
Krebs, Charles K. Ecology - 4th ed. 1994. HarperCollins College Publishers,
New York, New York.
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