What kind of evolutionary phenomenon most strongly shaped human evolution as they spread from Africa?
A. Natural selection leading to adaptations to new ecosystems and better resistance to disease.
B. Small population sizes and founder effects reducing genetic variation with every migration and increasing the accumulation of deleterious mutations.
C. New mutations that increased genetic variation.
D. Increase in genetic variation due to lineages diverging because of loss of predators.
Answer: B. Small population sizes and founder effects reducing genetic variation with every migration and increasing the accumulation of deleterious mutations.
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