The process of natural selection is used to explain the mechanism of evolution. This theory, proposed by Charles Darwin, suggests that individuals with advantageous traits are more likely to survive and reproduce. Over time, these traits become more common in the population, leading to gradual changes in species. Natural selection acts through factors such as variation, competition, and environmental pressures. It plays a crucial role in shaping biodiversity and adapting organisms to their environments, contributing to the diversity of life we see today.