These micro organism are somewhat similar to Archeabacteria and Eubacteria. Many don't bother us at all, but some can cause sleeping sickness and malaria. Protozoa is actually Greek. Prota, meaning first, and Zoa, meaning animal, Prositst were actually the first animals! (How'd he come to that conclusion..) Protist Include algae, Slime, and molds that don't fit into the fungus class and many other single celled, limited motile organisms. You can find them in many wet places like ponds and streams. They are important because they have the ability to eat bacteria, preventing them from CONTROLLING THE WORLD! Just kidding, Some protist act as a population buffer to keep bacteria from growing too much.you have some protist in your body that aids with exactly that.