re: How do you explain the origin of the various human races scientifically?

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Time to take another class. shite has changed

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No it hasn't. Forensic anthropology still refers to the various "races" (note the quotation marks) as Mongoloid, Caucasoid, Negroid, and Australoid. It's just a means of classification.

Otherwise, you are correct that there are studies that show there is no genetic variation between the "races". There are others that indicate there is a very small amount of genetic variation, which, as I said earlier, is probably to do with mate selection.

The former may be correct as it seems there may be more genetic variation between an Ashkenazi Jew and a German than there is between a Japanese man and a German, despite both the Ashkenazi Jew and the German being Caucasoid. But really, both findings are correct because that has to do with mate selection.