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In biological taxonomy, a domain (also superregnum, superkingdom, empire, or regio<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>) is the highest taxonomic rank of organisms in the three-domain system of taxonomy designed by Carl Woese, an American microbiologist and biophysicist. According to the Woese system, introduced in 1990, the tree of life consists of three domains: Archaea (a term which Woese created), Bacteria, and Eukaryota.<ref>{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref> The first two are all prokaryotic microorganisms, or single-celled organisms whose cells have no nucleus. All life that has a nucleus and membrane-bound organelles, and most multi-cellular life, is included in the Eukaryota.


Domain (biology) sections
Intro   Characteristics of the three domains of life   Exclusion of viruses  Alternative classifications   See also    References    External Links   

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