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Principal #1 Rats either have a black colored body or a white colored body.
Principal #2 Overpopulation: Rats are producing about 3, about 1 lives Struggles to survive: The white rats are not camouflaging with the environment so they are being seen and eaten.
Principal #3 The rats with a black colored body are being able to camouflage with the environment so it has the better traits and they will survive and reproduce.
Principal #4 The black colored body traits is better adapted to the environment, so it will be common in the population.
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