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There are no longer "pure" Kobol-evolved humans living, meaning that humanity, as it was defined by people in the Twelve Colonies of Kobol, has become extinct. The modern humans of Earth are a product of hybridization between them and the original indigenous native Earth-evolved Homo sapiens.
A notable physiological distinction of Kobol-evolved humans from Earth-evolved humans was the lack of a universal donor blood type—Type O Negative.