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Plankton are a very general taxon of organisms, classified by where they live (pelagic zone of any large body of water), not by evolutionary descent. They can belong to Animalia, Plantae, Archaebacteria, or Eubacteria. They even include larvae but not adults of certain species of animal, such as sea urchins and starfish. Looking at the evolutionary tree, plankton is a very vague term.

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13y ago

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