Definition of Plankton

small organisms that float in the ocean and serve as a food source for many marine animals

Examples of Plankton in a sentence

Jellyfish are a common type of plankton that can push themselves forward in the sea but can’t swim against current.  🔊

Green algae are a common type of plankton that are eaten by fish and sea snails.  🔊

Though plankton are living organisms, they cannot swim through the sea but only float.  🔊

All of the fish in Nate’s aquarium died because he didn’t have enough plankton and other small organisms to feed them.  🔊

Because they are a great source of food, marine animals need tiny plankton to survive.  🔊

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