In
biological taxonomy, a domain (also superregnum, superkingdom, or empire) is a
taxon in the highest
rank of
organisms, higher than a
kingdom. Domain (or its synonyms) is the most inclusive of these biological groupings. The arrangement of taxa reflects the fundamental evolutionary differences in the
genomes. There are several modern alternative domain classifications of
life. Among them are:The
two-empire system, with top-level groupings of
Prokaryota (or
Monera) and
Eukaryota empires.The six-kingdom system with top-level groupings of
Protista,
Archaebacteria,
Eubacteria,
Fungi,
Plantae, and
Animalia. and the most recent, The
three-domain system of
Carl Woese, introduced in
1990, with top-level groupings of
Archaea,
Bacteria, and
Eukaryota domains. As these groupings depend primarily on the analysis of
genetic sequence data and
cladistics, additional proposed arrangements are to be expected.
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