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Final answer:

Plankton, nekton, and benthos are the three main categories of marine organisms.


Explanation:

Plankton are tiny aquatic organisms that cannot move on their own, including phytoplankton and zooplankton. Nekton are aquatic animals that can propel themselves through water, such as fish and shrimp. Benthos are organisms that live at the bottom of bodies of water, like sponges and clams.


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