The process of change in species over time is called evolution. Evolution is driven by mechanisms such as natural selection, genetic drift, mutations, and gene flow. Over generations, species adapt to their environments, leading to variations and sometimes the emergence of new species. This concept is foundational in the field of biology, explaining the diversity of life on Earth and the relationships among different organisms. Charles Darwin's contributions to the theory of evolution, particularly the idea of natural selection, have profoundly influenced our understanding of biological change and adaptation.