Systematics is the study of organismic diversity as that diversity is relevant to some specific kind of relationship thought to exist among populations, species or higher taxa (Wiley, 1989).
See also: taxonomy, phylogeny
... Julia Boggs Dent[?] (1826-1902) on August 22, 1843 and they had four children: Frederick Dent, Ulysses Simpson, Jr., Ellen Wrenshall, and Jesse Root.
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