Maintaining the friendly writing style that has made the book a best-seller, the Tenth Edition continues to incorporate true and relevant stories using a chapter-opening Case Study that is revisited throughout the chapter and concluded at the end of the chapter. New to the Tenth Edition are Learning Goals and Check Your Learning questions that help students assess their understanding of the core concepts in biology. To increase the book’s focus on health science, additional Health Watch essays are provided throughout units, and more anatomy & physiology content has been incorporated into the main narrative. Other highlights include new or revised Consider This questions, Have You Ever Wondered? Questions, and MasteringBiology.