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ShareProtozoa are single-celled eukaryotes (organisms whose cells have nuclei) that commonly show characteristics usually associated with animals, most notably mobility and heterotrophy.
They are often grouped in the kingdom Protista together with the plant-like algae and fungus-like water molds and slime molds.
In some newer schemes, however, most algae are classified in the kingdoms Plantae and Chromista, and in such cases the remaining forms may be classified as a kingdom Protozoa.
The name is misleading, since they are not animals (with the possible exception of the Myxozoa).
Protozoa have traditionally been divided on the basis of locomotion.
Most protozoans are too small to be seen with the naked eye - most are around 0.01-0.05 mm, although forms up to 0.5 mm are still fairly common - but can easily be found under a microscope.
For more information about the topic Protozoa, read the full article at Wikipedia.org, or see the following related articles:
Protist — Protists are a heterogeneous group of living things, comprising those eukaryotes that are neither animals, plants, nor fungi. They are usually ... > read more
Amoeba — Amoeba (also spelled ameba) is a genus of protozoa that moves by means of temporary projections called pseudopods, and is well-known as a ... > read more
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Dinoflagellate — The dinoflagellates are a large group of flagellate protists. Some species, called zooxanthellae, are endosymbionts of marine animals and protozoa, ... > read more
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Pathogen — A pathogen or infectious agent is a biological agent that causes disease or illness to its host. The term is most often used for agents that disrupt ... > read more
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