Answer the following question given this paragraph: 

Many human diseases are caused by protists. Most of them are caused by protozoa. They are parasites that invade and live in the human body. The parasites get a place to live and nutrients from the human host. In return, they make the host sick. Examples of human diseases caused by protozoa include giardiasis and malaria.


Q: Giardiasis and malaria are diseases caused by what organism?

 Choices:

- worms

- larvae

- bacteria

- protozoa

A:
protozoa
