In Theory,a Biological Race Is a Geographically Isolated Subdivision of a Species.Humanity

In theory,a biological race is a geographically isolated subdivision of a species.Humanity (Homo sapiens) lacks such races because

A) although humans exhibit biological differences, these are only skin deep.
B) human populations have experienced a type of controlled breeding distinct from that of dogs and roses.
C) human populations have not been isolated enough from one another to develop such discrete groups.
D) they are politically incorrect.
E) humans are less genetically predictable than animals and plants susceptible to domestication.

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