A population of beetles in which some individuals are blue and some individuals are green evolves because the green individuals survive better, and so leave more offspring. This mechanism of evolution is known as

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Natural selection 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. In this scenario, green beetles surviving better and leaving more offspring is an example of natural selection at work.

A Population of Beetles in Which Some Individuals Are Blue