Three domains of life

According to the Woese system, introduced in 1990, the tree of life (biology) consists of three domains: Archaea (a term which Woese created), Bacteria, and Eukarya. The first two are all prokaryotic microorganisms, or singlecelled organisms whose cells have no nucleus. , Genetics, ThreeDomainsOfLive, archaea, Eukarya, prokaryotic, singlecelledOrganisms, nucleus