Antropolog pada padanna C. Loring Brace, filsuf Jonathan Kaplan nenniyya Rasmus Winther, nenniyya tau maccaana genetik'e Joseph Graves, mappahangngi makkeda namuni engka laleng riruntui rupanna biologis'e nenniyya genetik'e iyya kassara'na padai assipulunna iyya biasanna ribettuwaangi "mancaaji ras benua", iyyae ripattuujui koriyamanenna populasie.