Which best describes the difference between protists that have cilia and those that have flagella?

Cilia are short, hair-like structures that beat to move a protist. Flagella are longer, whip-like structures that propel it, often one or a few at a time. These structures describe how the protists move; they do not determine whether they are animal-like, plant-like, heterotrophs, or autotrophs. Therefore, the best choice is “Those with cilia move using hair-like extensions, and those with flagella move using a single whip-like extension.”

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