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Carl Woese compared the genetic sequence of many different organisms, especially, microbes, to construct phlogenetic tree of life
Carl Woese compared the genetic sequence of many different organisms, especially, microbes, to construct phlogenetic tree of life. He found three distinct branches of life, including the previously unrecognized Archaea. The majority of the most deeply rooted organisms are extremophiles living at high temperature
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Woese's initial intention was to unravel aspects of evolution -- to establish a top-down family tree of life and infer the complex history of branching from parent to daughter species. This evolutionary pursuit led quickly to insights regarding the nature of the last common ancestor. He proposed, for example, that Archaea and Bacteria arose long before Eukarya. ~ Page 139
An important conclusion from these phylogenetic studies is that Earth's earliest cells were not so different from those of today. They probably relied on similar, though simpler, biochemical pathways. These similarities provide a clear focus for experimental studies of emergent biochemistry. ~ Page 141
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