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
... (1648)[?] - Thirty Years' War
Battle of Prague (1744)[?] - War of the Austrian Succession
Battle of Prague (1757)[?] - Seven Years' War
Battle of Puebla (1847)[?] - ...
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