How does natural selection contribute to evolution?

Natural selection is a key mechanism in the process of evolution. It involves the process by which organisms that are better adapted to their environment tend to survive and produce more offspring. Over time, this leads to the perpetuation of advantageous traits within a population, resulting in evolutionary change. For example, in a population of birds, those with beaks that are better suited for obtaining food in their environment are more likely to survive and pass on their genes to the next generation. This process ultimately leads to the accumulation of favorable traits, driving the evolution of species.