An AP Biology exam study and review guide (includes print & digital versions) covering all 8 College Board units — chemistry of life, cell structure, cellular energetics, cell communication, heredity, gene expression, evolution, and ecology. Each major concept, every must-know scientist, and every frequently tested distinction is explained and practiced. This study guide includes test taking tips and 100 practice questions. An answer key with explanations is also included. Print out or send to y