Designed to give students a deep understanding of the central topics of introductory biology, E. O. Wilson’s Life on Earth is a captivating iBooks Textbook presented as a seven-unit collection. This sixth unit surveys the astonishing diversity of life—from bacteria and viruses to reptiles and mammals. There are a million named species on our planet (and many more to be discovered). What are they? How do they live? And which evolutionary paths did they take to become the way they are? Each unit of the engagingly interactive E. O. Wilson’s Life on Earth features video, photo galleries, and Multi-Touch images and illustrations that inspire students to study, enjoy, and help protect the wonders of life on Earth.