On what basis have physical anthropologists criticized modern racial classification systems?

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Physical anthropologists have criticized modern racial classification systems because they fail to account for genetic change, intermarriage, and population movements. Race is a social construct, and genetic variation occurs on a spectrum rather than in distinct racial groups. Additionally, physical features such as skin color are not the only indicators of genetic variation. Therefore, categorizing people into distinct racial groups oversimplifies complex genetic diversity.

On What Basis Have Physical Anthropologists Criticized Modern Racial Classification