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=== Taxonomy ===
=== Taxonomy ===
[[Image:Darwin_tree_category.jpg|thumb|"Darwin's first drawing of conceiving a 'Tree of Life'"]]
A [[phylogenetic tree]] of [[evolutionary tree|all living things]], based on [[rRNA]] [[gene]] data, showing the separation of the three domains [[bacterium|bacteria]], [[archaea]], and [[eukaryote]]s as described initially by [[Carl Woese]]. Trees constructed with other genes are generally similar, although they may place some early-branching groups very differently, presumably owing to rapid rRNA evolution. The exact relationships of the three domains are still being debated.]]
A [[phylogenetic tree]] of [[evolutionary tree|all living things]], based on [[rRNA]] [[gene]] data, showing the separation of the three domains [[bacterium|bacteria]], [[archaea]], and [[eukaryote]]s as described initially by [[Carl Woese]]. Trees constructed with other genes are generally similar, although they may place some early-branching groups very differently, presumably owing to rapid rRNA evolution. The exact relationships of the three domains are still being debated.]]
