Three-domain system

<p>The three-domain system is a <a href="/facts/Taxonomy_(biology)/Qkg8wuyw">taxonomic</a> <a href="/facts/Classification_system/0YnvM2EF">classification system</a> that groups all <a href="/facts/Cell_(biology)/bLM9UQvy">cellular</a> <a href="/facts/Life/DNw7NUId">life</a> into three <a href="/facts/Domain_(biology)/RpP6V7n6">domains</a>, namely <a href="/facts/Archaea/Adxh0aHw">Archaea</a>, <a href="/facts/Bacteria/wC8xSCsU">Bacteria</a> and <a href="/facts/Eukarya/SkwyPLMA">Eukarya</a>, introduced by <a href="/facts/Carl_Woese/uzzVL0LR">Carl Woese</a>, <a href="/facts/Otto_Kandler/YxfDa496">Otto Kandler</a> and <a href="/facts/Mark_Wheelis/amHm4D1t">Mark Wheelis</a> in 1990. The key difference from earlier classifications such as the <a href="/facts/Two-empire_system/28zQoSBM">two-empire system</a> and the five-kingdom classification is the splitting of Archaea (previously named "archaebacteria") from Bacteria as completely different organisms.
</p><p>The three domain hypothesis is considered obsolete by some since it is thought that eukaryotes do not form a separate domain of life; instead, they arose from a fusion between two different species, one from within Archaea and one from within Bacteria. (see  <a href="/facts/Two-domain_system/aBLFJyxs">Two-domain system</a>)
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Three-domain system open-in-new

Three-domain system