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Wikipedia: Bacterium
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A single-celled organism without a nucleus, that is, a prokaryote. Bacteria were formerly classified in the kingdom Monera, but are now given their own domain. The domain Archaea contains single-celled organisms also without a nucleus which were formerly considered to be most closely related to bacteria, but which are now considered to be separate due to their striking similarities to Eukaryota in some respects.
A few kinds of bacteria are parasites responsible for disease.