"There are several potential explanations for why rats with white fur might begin to outnumber rats with black fur. It could be a natural selection process, with white fur rats being more suited to their environment and thus more likely to survive and reproduce. It could also be due to genetic drift, with white fur rats simply happening to have more offspring due to chance. Additionally, there could be a mating preference for white fur in the rat population, with rats preferring to mate with white-furred partners."

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Rats with white fur might outnumber black-furred rats due to natural selection, as white-furred rats may be better adapted to their environment. Genetic drift could also play a role, resulting in a higher number of offspring for white-furred rats by chance. Additionally, there could be a mating preference in the population favoring white fur. These factors combined could lead to the increased prevalence of white-furred rats.