Evolution is the process through which living things change with time, adapting to the changing environment around them, and new species form. Fossils provide important evidence for the theory of evolution, but so too do other kinds of evidence, such as the distribution of modern species, animals' appearance, and DNA. This book offers a comprehensive and lavishly illustrated account of Darwin's observations and theory on evolution, the body of knowledge that has been added to by successive generations of scientists, the latest information on what we know, recent discoveries, and likely future breakthroughs in understanding. Supplemental content includes an activity spread, a substantial and highly detailed timeline, and a list of key people with mini-biographies.