[S.O.S121.500]

Ah ha!! You are beginning to understand evolution. The “parent” species need not, itself, go extinct

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Well, common and broadly accepted theory has Caucasians evolving from Africa and Africans.....

[JimSEA]

That would be homo sapiens evolved in Africa and spread throughout Africa and the world in time. Caucasians are a localized adaptation like light skin Asians and not a separate species. Much like a Siamese cat is yet a cat.