Phenomenon: Lactase production increased in the northern European population over several generations., Evidence: The data show that the percentage of adults producing lactase increased from 12% in generation 0 to 82% by generation 6., Explanation: This occurs because individuals who could digest lactose were able to obtain nutrients and energy from milk, giving them a survival and reproductive advantage in populations that relied on dairy., Result: Individuals with the genetic trait for lactase production were more likely to survive and reproduce, causing the frequency of lactase production to increase in the population over time.,

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