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19 - PROKARYOTIC DIVERSITY BIOL 4125 SPRING 2009 LECTURE 19...

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PROKARYOTIC DIVERSITY BIOL 4125 SPRING 2009 LECTURE 19 Deep-branching Bacteria
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Portion of the only figure in Darwin’s Origin of Species Darwin used a tree to represent the divergence of variants within a species, showing successively more difference in a single lineage ( a 1 through a 10 ) and splitting into multiple lineages ( m, s, i , etc.), some of which will become new species. “Limbs divided into great branches ...were themselves once, when the tree was small, budding twigs; and this connection of the former and present buds by ramifying branches may well represent the classification of all extinct and living species in groups subordinate to groups"
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