Here's why:

* Flagella are long, whip-like structures that protrude from the cell. They are used for movement, helping the organism to swim or move through its environment.

* Flagellates are a diverse group of organisms that includes both single-celled (unicellular) and multicellular organisms.

Examples of Flagellates:

* Bacteria: Some bacteria, like E. coli, use flagella for movement.

* Protists: Many protists, such as Euglena and Trypanosoma, use flagella to propel themselves.

* Sperm cells: In animals, sperm cells use flagella to swim towards the egg.

It's important to note that not all organisms with flagella are called "flagellates." The term "flagellate" is typically used for single-celled organisms.