House sparrows living in Chicago vary in the amount of insulation their feathers offer. The polar vortex cold snap last winter killed almost half the population. After the winter, the remaining sparrows have more insulation, on average, than the population did before the cold snap. Your friend says that this is an example of evolution through natural selection. You disagree and say that it can’t yet be determined whether the population of sparrows has evolved. Explain to your friend why you can’t conclude that feather insulation has evolved. What would you need to observe about the population of sparrows to determine whether evolution has occurred?
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