Natural selection acts on existing variations from "summary" of The Origin of Species by Charles Darwin
Natural selection, as I have explained earlier, is the process by which certain traits become more common in a population over time because individuals with those traits are more likely to survive and reproduce. This process is based on variations that already exist within a population. These variations can be inherited from parents or can arise from random mutations. When individuals with certain variations are better able to survive and reproduce in a given environment, those variations become more common in the population over time. This is because individuals with those variations are more likely to pass them on to their offspring. In this way, natural selection acts on existing va...
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