Races

This study is based on the following premises: human beings differ in their physiological reactions to their different environments and consequently differ in appearance; individuals who resemble each other in observable characteristics tend to be grouped together geographically; therefore, races ex [...]
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This study is based on the following premises: human beings differ in their physiological reactions to their different environments and consequently differ in appearance; individuals who resemble each other in observable characteristics tend to be grouped together geographically; therefore, races exist in man as in any other species.