With the amount of information in biology growing constantly, it is a challenge for readers to develop a sense of scientific literacy and to become educated consumers. This volume helps readers manage a wealth of scientific information in a manner that is both meaningful and long-lasting. Features significant content revisions as well as new figures and photographs in every chapter. Includes anentirely new chapter on conservation biology. Presents approximately 40% new photos. Adds new bioethics icons to call out essays that relate to this timely topic. A comprehensive reference for anyone interested in learning more about biology.