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Bacteria

Bacteria (singular: bacterium) are a major group of living organisms.

Most are microscopic and unicellular, with a relatively simple cell structure lacking a cell nucleus, and organelles such as mitochondria and chloroplasts.Bacteria are the most abundant of all organisms.

Many pathogens, disease-causing organisms, are bacteria.

Note: This article excerpts material from the Wikipedia article "Bacteria", which is released under the GNU Free Documentation License.

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