Flagella are whip-like structures that protrude from the cell and help the protist move through its environment.

Here are some examples of flagellated protists:

* Euglena: A common freshwater protist that uses its flagellum for both movement and feeding.

* Trypanosoma: A parasitic protist that causes African sleeping sickness and is transmitted by the tsetse fly.

* Giardia: A parasitic protist that causes giardiasis, an intestinal infection.