Which of the following is the best example of humans undergoing evolution, understood as "descent with modification"?

Question

Which of the following is the  best  example of humans undergoing evolution, understood as "descent with modification"?

Answer

widening of the pupils of the eyes when one encounters dimly lit conditions

Answer

reduction in coarseness of body hair over millennia

Answer

reduction in number of hairs on the head of a balding person

Answer

increase in weight over an individual's lifetime

Answer

increased pigment production by the skin of a person who is exposed to increased UV radiation levels

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