AP Biology is rigorous and challenging, but Principles of Life helps lighten the load with one-of-a-kind resources for students and teachers. The foundation of the POL 2e program is a brief text that models the intent of the AP (R) redesigned course with more depth, less breadth, and a greater focus on concepts and applications. To help students with this often intimidating course, we created LearningCurve -- a game-like adaptive quizzing system that provides formative assessment in a friendly, low-stakes environment. And to ease the stress of planning and grading, we created a full, wrap-around Teacher's Edition. Therein, experts in AP Biology offer point-of-use, in-the-margin teaching tips such as "Doing" Science, AP Exam Tips, Mini-Labs, Common Misconceptions, Science Literacy, and more. This textbook is available with LaunchPad. LaunchPad combines an interactive ebook with high-quality multimedia content and ready-made assessment options, including LearningCurve adaptive quizzing. See 'Instructor Resources' and 'Student Resources' for further information.