The genetic heterogeneity of an early culture group in this modern-day country has challenged the traditional “dual structure” theory of this country’s genetic heritage. It’s not Mexico, but many ancient clay figurines with exaggerated proportions created in this country seem to depict people wearing goggles. The name of one archaeological culture in this non-European (10[1])country references their “cord-marked” pottery. (10[1])Distinctive keyhole-shaped burial mounds (10[1])are unique to this country’s kofun archaeological period. Dogū figurines were created by this country’s ancient Jōmon culture, who were likely partially displaced by the Yayoi people. For 10 points, name this modern-day country, many of whose ancient inhabitants migrated to its islands of Kyūshū and Honshu. ■END■