by Bridger Tjornehoj

Protozoans are single celled-organisms that don’t lack a nucleus unlike prokaryotes. there are four classified groups of protozoans: Flagellate protozoa, amoebid protozoa, sporozoans, and ciliates. Most protozoans are parasites and some do have the power to kill you, like the extremely rare brain eating amoeba. Anyway, protozoans typically live in water and moist places such as streams, lakes and ponds. When the water dries up they make protective crust like cysts so they don’t die of thirst if a dry season hits.They will stay like that until moisture comes back. Only about a dozen protozoans are deadly to people out of thousands, though kill hundreds of thousands yearly like the virus.

Viruses are prokaryotes because they don’t have a nucleus. If viruses are living they are for sure the simplest organisms though scientists are not sure if viruses are living or not because they are just so simple. They kill hundreds of thousands of people yearly partially because they change their genes so the lymphocytes don’t recodnise them. (learn what a lymphocyte and other defenses like platelets, white blood cells and more in Human Cell Defenses)