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Archaea
Archaea (/ɑːrˈkiːə/ (listen) or /ɑːrˈkeɪə/ ar-KEE-ə or ar-KAY-ə) (singular archaeon) constitute a domain of single-celled organisms. These microorganisms
Domain (biology)
According to this system, the tree of life consists of three domains: Archaea, Bacteria, and Eukarya. The first two are all prokaryotic microorganisms
Asgard (archaea)
Asgardarchaeota is a proposed superphylum consisting of a group of uncultivated archaea that includes Lokiarchaeota, Thorarchaeota, Odinarchaeota, Heimdallarchaeota
Eukaryote
a nucleus enclosed within membranes, unlike prokaryotes (Bacteria and Archaea), which have no membrane-bound organelles. Eukaryotes belong to the domain
Three-domain system
introduced by Carl Woese et al. in 1977 that divides cellular life forms into archaea, bacteria, and eukaryote domains. In particular, it emphasizes the separation
Prokaryote
κάρυον (karyon) "nut or kernel". Prokaryotes are divided into two domains, Archaea and Bacteria. Species with nuclei and organelles are placed in the third
Kingdom (biology)
States used a system of six kingdoms (Animalia, Plantae, Fungi, Protista, Archaea/Archaebacteria, and Bacteria/Eubacteria) while textbooks in countries like
Outline of life forms
existed on Earth, amounting to over five billion species, are extinct. Archaea – a domain of single-celled microorganisms, morphologically similar to
Microorganism
diverse. Of the three domains of life identified by Carl Woese, all of the Archaea and Bacteria are microorganisms. These were previously grouped together
Unicellular organism
prokaryotic organisms and eukaryotic organisms. Prokaryotes include bacteria and archaea. Many eukaryotes are multicellular, but the group includes the protozoa