Answer the following question given this paragraph: 

Some animal-like protists use their "tails" to eat. These protists are called filter-feeders . They acquire nutrients by constantly whipping their tails, called flagellum , back and forth. The whipping of the flagellum creates a current that brings food into the protist.


Q: Protists which use their tails to eat are called what?

 Choices:

- swimmers

- cycle - feeders

- flagellators

- filter-feeders

A:
filter-feeders
