Book excerpt: Whether you’re a student or an adult looking to refresh your knowledge, Barron’s Painless Biology provides review and practice in an easy, step-by-step format. An essential resource for: Virtual Learning Homeschool Learning pods Supplementing classes/in-person learning Inside you’ll find: Comprehensive coverage of biology, including, nature of science, cell anatomy, biochemistry, animals and plants, genetics, and much more Diagrams, charts, and instructive science illustrations Painless tips, common pitfalls, and informative sidebars Brain Tickler quizzes and answers throughout each chapter to test your progress