A Companion to the Philosophy of Biology offers concise overviews of philosophical issues raised by all areas of biology. Addressing both traditional and emerging areas of philosophical interest, the volume focuses on the philosophical implications of evolutionary theory as well as key topics such as molecular biology, immunology, and ecology. Comprising essays by top scholars in the field, this volume is an authoritative guide for professional philosophers, historians, sociologists and biologists, as well as an accessible reference work for students seeking to learn about this rapidly-changing field.