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History of humans

Lactose intolerance is one example of natural selection. We are the only species that doesn't become lactose intolerance as we grow up.

Natural Selection

An example is the sickle hemoglobin gene, which occurs in people who live in certain regions of Africa and other areas where malaria is endemic. This gene mutation makes people who have it more resistant to malaria. The mutation probably happened over hundreds of generations as a result of the constant exposure to malaria and people contracting and surviving it.