Biology: A Guide to the Natural World remains the only book written and illustrated from the ground up for those with little knowledge of biology. The Third Edition retains its best features--rich, full-color art, an accessible writing style, and a full complement of digital resources--while substantially updating the content throughout to emphasize the relevancy of biology to readers' lives. A seven-part organization covers essential parts: atoms, molecules, and cells; energy and its transformation; how life goes on: genetics; life's organizing principle: evolution and the diversity of life; a bounty that feeds us all: plants; what makes the organism tick? animal anatomy and physiology; and the living world as a whole: ecology and behavior. For the promotion of biological literacy--to make individuals aware that they need it to participate in the workforce, make everyday decisions, and make informed choices at the ballot box.