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No, plankton are any microscopic sea-dwelling organisms. these can be plants OR animals.

I just checked (April 20, 2011) on Wikipedia: plankton means 'drifter' or 'wanderer' and can be any of the plants or animals UP TO JELLYFISH size. So small shrimp known as 'krill', ARE part of what makes up plankton.

Please see the link:

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14y ago

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