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Take group 1. measure likelyhood "n" of high melanin count. Take group 2. Rinse, wash, repeat. Compare N1 and N2. Tell me there isn't something distinct. Race is not a hard line...but its still a meaningful term. and just because i opted to bifurcate my example does not mean you get to disprove it by noting that that's a simplification. obviously there are mexicans...and i know this. Go take a look in a bird guide. If you place several different kinds of warblers in a line, you might be able to construct a continuum of warblers so that they gradiate from one coleration to another. They may in fact be able to interbred, and thus be of the same species. But, if in certain areas there are high numbers of certainly colored birds,you say that's a social construction?
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