Definitive reference on the subject of biology containing approximately 800 A-to-Z entries, 20 prose essays, 100 line drawings, and 50 to 75 black-and-white photographs. It offers comprehensive coverage of leading discoveries in biology along with general biology definitions, thought-provoking essays, and biographies of notable biologists who have contributed to the science of biology. It also guides readers to the latest web-sites and most recent resources on the net that relate to biology.