This is the third edition of a clear, effective study guide to help students in an introductory-level college biology course master the fundamentals - and get the best possible grade. Written especially for nonmajors, the concise explanations of core biology concepts are accompanied throughout with helpful illustrations and tables and a minimum of jargon. The author's objective is to illustrate how the concept of evolution is the key to understanding the major subdisciplines of biology, including genetics, ecology, biodiversity, botany, and zoology.