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activity can lead to unintended changes in the environment. The human activity will have a possible negative effect on a certain population, causing many individuals from said population to die due to not being adapted to this new pressure. The individuals that are better adapted to this new pressure will survive and reproduce at a higher rate than those who are at a disadvantage. This occurs over many generations until the population as a whole is better adapted to the pressure. This is natural selection at work, but the pressure is coming from

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