BIOLOGY: THE UNITY AND DIVERSITY OF LIFE, 15th Edition, reveals the biological world in wondrous detail. Its multitude of eye-catching photos and images will keep you fascinated, while helpful text features help you master the material. Chapter-opening Core Concepts enable you to focus on the topics that matter most in every chapter. Each section within a chapter begins with clear Learning Objectives, and section-ending Take Home Messages reinforce these key concepts. Other invaluable features include a running glossary, case studies, self-test questions and data-analysis problems.