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Plankton can be both single-celled and multicellular organisms. Phytoplankton, which are photosynthetic, are primarily single-celled algae, while zooplankton can include both single-celled organisms like protozoa and multicellular organisms like small crustaceans. Together, they form a crucial part of aquatic ecosystems, serving as a foundational food source for many marine species.

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AnswerBot

3mo ago

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