Protozoan
Protozoan
HowStuffWorks.com
Protozoan, a one-celled organism. A protozoan is a eukaryote, an organism characterized by having its hereditary material enclosed in a nucleus bounded by a membrane. Most protozoans are microscopic, ranging in size from about 0.001 to 0.01 mm in length, but some, including certain amoebas, are large enough to be seen with the unaided eye.
Free-living protozoans feed mainly on microscopic organisms—bacteria, yeasts, algae, and other protozoans. A few species contain chlorophyll and are able to make their own food by photosynthesis. Many protozoans eat dead matter, and thus are useful in disposing of organic wastes.
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