Book excerpt: UNLOCK THE SECRETS OF BIOLOGY with THE PRINCETON REVIEW. High School Biology Unlocked focuses on giving you a wide range of lessons to help increase your understanding of biology. With this book, you'll move from foundational concepts to a look at the way biology affects your life every day. End-of-chapter drills will help test your comprehension of each facet of biology, from molecules to mammals. Don't feel locked out! Everything You Need to Know About Biology. • Complex concepts explained in straightforward ways • Walk-throughs of the ins and outs of key biology topics • Clear goals and self-assessments to help you pinpoint areas for further review • Guided examples of how to solve problems for common topics Practice Your Way to Excellence. • 100+ hands-on practice questions, seeded throughout the chapters and online • Complete answer explanations to boost understanding • Bonus online questions similar to those you'll find on the AP Biology Exam and the SAT Biology E/M Subject Test High School Biology Unlocked covers: • The Nature of Science • Biomolecules and Processing the Genome • Cells and Cellular Energy • The Human Body • Genetics • Diseases • Plants • Ecology • Biological Evolution ... and more!