protozoan (a unicellular heterotrophic protist, such as an amoeba or a ciliate)
Bacterium is a type of bacteria which if I'm not mistaken is common. Like on everyday items.
Through mutation of their genetic material or by acquiring pieces of DNA that code for the resistance properties from other bacteria.
Single-celled, animal-like, eukaryotic organisms of the kingdom Protista. Protozoans can occur wherever moisture exists. There are many parasites and commensals of plants and animals, as well as...
Juvenile fish and crustaceans-other protozoans (Amoebas and cilates)