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| | Cavalli-Sforza on Human Races |
 | | Races are, in fact, generally very far from pure and, as a result, any classification of races is arbitrary, imperfect, and difficult. |
 | | However human races are defined, there is no evidence of any decrease in fertility in crosses between even the most distant human races (for instance, between Africans and native American Indians). |
 | | Yet the validity and usefulness of this breakdown into smaller and smaller groups is doubtful, at least on the basis of present data. |
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