Humanity (Homo sapiens)lacks distinct races because human populations have not been isolated enough from one another to develop into discrete groups.
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Q26: Human biological differences are evident only to
Q27: Physical features cluster into discrete genetic units.
Q28: Skin color is a simple biological trait
Q29: In the case of skin color,natural selection
Q30: Thanks to medical advances,genetic resistance to diseases
Q32: The indigenous communities in the tropical regions
Q33: The role of natural selection in producing
Q34: There is much greater variation within each
Q35: Historically,scientists have approached the study of human
Q36: Biological races have been scientifically discredited in
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