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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