In a population of zebras, individuals that run faster may have a higher chance of escaping predators, leading to increased survival and reproductive success. Over time, these faster zebras are more likely to pass on their genes to the next generation, resulting in a gradual increase in the average running speed of the population. As this process continues, the traits that enhance speed become more prevalent, demonstrating natural selection at work. Ultimately, the population evolves to be faster as a response to environmental pressures, such as predation.
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