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#Building a 16S rDNAPhylogenetic  Tree What _is_ this thing? At this point, you have an organism in pure culture, but you do not know what it is. If you found a creature crawling on the ground and  wanted to identify (or classify) it, you might look at it's morphology and ask what it most _looks_ like. If it has six legs, you might hypothesize it is some kind of