Bacteria (single: bacteria), microscopic, unicellular organisms. Most bacteria range in buy strattera online size from 0. 15 to 4 microns. (Micrometer 0. 001 mm [1/25, 000 inches]). The largest known bacteria, Thiomargarita namibiensis, more than 750 micrometers in length. Bacteria found in soil, water and air. They are also found on plants, on the surface of damaged or decaying matter, and in the gastrointestinal and reproductive tract of man and other animals. Although many infectious diseases caused by bacteria, relatively few pathogenic species in comparison with many friendly and helpful. .
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