Contributor(s): Author: David M. Hillis Author: David E. Sadava Author: Richard W. Hill AP(R) 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(R) Biology offer point-of-use, in-the-margin teaching tips such as "Doing" Science, AP(R) Exam Tips, Mini-Labs, Common Misconceptions, Science Literacy, and more. An answer key and connections to the AP(R) Curriculum Framework round out this valuable tool.