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Heterotrophic Protist Classification

A heterotrophic protist that is free-living and utilizes flagellum for locomotion would be classifies as ... ?

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I think what you are looking for, and correct me if I am wrong, is a certain phylum of protist.

However, there are two that are representative of the short description given and they are Phylum EUGLENOPHYTA and Dinoflagellata.

I will go over each to help clarify

EUGLENOPHYTA are probably the most well known flagellates. They are usually free ...