Flagellates
Similarly complex single-celled organisms, flagellates have whip-like appendages called flagella sticking out of their cells.
The flagella are used for locomotion and to direct food particles or cells into the organism’s mouth-like opening. Flagellates dine on bacteria, algae, and other protozoa.
Several well-known flagellates cause parasitic diseases, such as trypanosomes that cause sleeping sickness, and
Giardia lamblia, a parasite found in mountain streams and rivers that causes severe gastrointestinal distress.
