Freshwater and marine microscopic organisms that freely drift in fresh or salt water are called

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Plankton refers to microscopic organisms that float or drift freely in fresh or salt water. Fish are not microscopic and can swim against the current, so they are not considered plankton. Larvae refers to the early stage of development of animals, but not specifically to microscopic organisms in water. Benthos refers to organisms that live at or near the bottom of a body of water. Plants can be microscopic and drift in water, but plankton specifically refers to organisms that are not rooted in place.

Freshwater and Marine Microscopic Organisms That Freely Drift in Fresh