coupled to enhance reproductive success ,natural selection makes it look like different population

This line is talking about how natural selection can lead to the formation of new species. It states that natural selection can enhance the reproductive success of certain individuals within a population, which can lead to differences between different populations over time. This can ultimately result in the formation of new species.Natural selection is the process by which certain traits become more common in a population because those individuals with those traits are more likely to survive and reproduce. Over time, this can lead to differences between different populations, as the traits that are most beneficial in one environment may not be as beneficial in another.When these differences become significant enough, they can lead to the formation of new species. This is known as speciation. Essentially, the line you quoted is saying that natural selection can cause populations to diverge and eventually become different enough to be considered separate species.