The existence of superficial differences among groups of humans is primarily due to

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Geographic isolation can lead to differences in physical characteristics among groups of humans due to differences in environmental factors such as sunlight, temperature, and altitude. This can cause adaptations and changes in physical appearance over time, such as skin color variation. Temporal isolation refers to reproductive barriers caused by differences in breeding times, genetic incompatibility refers to the inability of certain individuals to produce offspring due to incompatible genetics, and behavioral isolation refers to differences in behavior that prevent individuals from reproducing with one another. None of these factors are primarily responsible for the superficial differences among groups of humans.

The Existence of Superficial Differences Among Groups of Humans Is