Industrialized Moths
When most people think of evolution, they imagine slow, incremental changes in a population of plants or animals. But evolutionary changes can also appear suddenly. This is illustrated by the most famous example of natural selection at work- the changing coloration of the peppered moth (Biston betularia ). The story of this population of light-colored moths that turned dark and then light again in response to environmental change is an elegant example of Darwinian evolution at work. What happened to the peppered moth reminds us how easily populations can adapt to new conditions in times of environmental stress.
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