What Is Life? A Guide to Biology with Physiology delves into the fundamental principles of biology, offering readers an in-depth exploration of living organisms and their physiological processes. Authored by Jay Phelan, this fourth edition provides a comprehensive understanding of biological concepts, making it accessible for students and enthusiasts alike. The book covers a wide range of topics from cellular structure to evolutionary theory, with a focus on how these principles apply to human physiology. With 1104 pages, this detailed guide is an essential resource for anyone seeking a thorough knowledge of biology.