Essential Biology, Fourth Edition provides essential, effective solutions to the challenges faced by instructors and their students in the non-majors biology course. *Three features (Biology and Society, Process of Science, and Evolution Connection) found at the beginning, middle and end of every chapter give students a memorable framework to take with them into the future. *One compelling topic anchors the three book features in each chapter to emphasize how biology is highly relevant. *The book and the media are designed from the ground up to teach biology to a wide range of students. *MasteringBiology, our online tutorial and assessment system, makes it easy to increase student participation and accountability.