are in and reproduce. Milk may also have prevented death from starvation when crops failed and food was scarce. The answer would be provided in the 20th and 21st centuries by a series of empirical data and mathematical models. The conclusion related. It is selection pressure that drives natural selection (survival of the fittest) and it is how we evolved into the species we are today. We have not eliminated genetic variation among humans.
Natural selection in humans is happening more than you think CBC
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Scientists have found that the majority of genes that have undergone recent evolution are associated with smell, reproduction, brain development, skin pigmentation and immunity against pathogens. In this book he maintained that all important People in Greek History the phenomenal variability observed in the biological world could only be understood under the principle of natural selection, which he defined as "The preservation of favorable individual differences and variations, and the destruction of those which are injurious". Infectious diseases continue to exert selective pressures on our genes, in an evolutionary arms race that is challenging modern medicine as pathogens become resistant to drugs. In short, we are still evolving. Colonising new environments favours faster reproduction apparently causing women to give birth at younger ages.
Ohno.4 Enzyme polymorphisms and the neutral hypothesis of molecular evolution,. I.1, proofs of descent of human from some inferior forms. This suggests that being able to drink milk into adulthood provided a strong evolutionary advantage in Europe. Or it may be because cows milk provides a much safer and cleaner alternative to drinking water that may cause disease. Sexual secondary characteristics of mammals, iII.