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 (10[1])proportions created in this country seem to depict (-5[1])people wearing goggles. (10[2])The name of one archaeological (10[1])culture in this non-European (10[2])country references their “cord-marked” pottery. (10[2]-5[1])Distinctive (10[2])keyhole-shaped burial (10[1]-5[1])mounds (10[5])are unique (10[3]-5[2])to this country’s (10[1])kofun (10[1])archaeological (10[6])period. (10[3])Dogū (10[2])figurines were created by this country’s ancient Jōmon (10[2]-5[1])culture, (10[1]-5[1])who were likely (10[1]-5[1])partially (-5[1])displaced (10[1])by the (10[1])Yayoi (10[1])people. (10[1])For 10 points, name this modern-day country, many of whose ancient inhabitants migrated to its islands of Kyūshū (10[3])and (10[2])Honshu. (10[4])■END■ (10[6])