人間の祖先はいつから色が見えるようになった？
It has been argued that it aided in the induction and acquisition of brain complements, resulting in an increase in the blond population. According to TheHistoryandGeographyofHumanGenes (1994), blonde hair became the dominant European hair color among Proto-Indo-European peoples in the area now known as Lithuania around 3000 B.C.
90 million years ago