Zooplankton | Marine Microorganisms, Planktonic Organisms, …
https://www.britannica.com/science/zooplankton
Webzooplankton, small floating or weakly swimming organisms that drift with water currents and, with phytoplankton, make up the planktonic food supply upon which almost all oceanic organisms are ultimately dependent. Many animals, from single-celled Radiolaria to the eggs or larvae of herrings, crabs, and lobsters, are found among the zooplankton.
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