Biology is a comprehensive introductory biology textbook for non-majors or mixed-majors courses that covers biology in a traditional order from the structure and function of the cell to the organization of the biosphere. The book, which centers on the evolution and diversity of organisms, is appropriate for a one- or two-semester course. Its concise, precise writing uses an economy of words to present the material as succinctly and clearly as possible, thereby enabling students to understand the concepts without necessarily asking the instructor to explain further.