Is race real?

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Is there a biological foundation for race? I often hear the claim that it is a "social construct," i.e. it exists only because of society and if society had been another way, the idea of race would not rear its ugly head. This leaves the differences in the races to be discarded as the product of racism in society and leaves no room for any biological explanation.

Is there any weight to this? I am not knowledgeable on any natural sciences, if you know any good places to start I would love to hear it.