This collection of specially commissioned essays puts top scholars head to head to debate the central issues in the lively and fast growing field of philosophy of biology Brings together original essays on ten of the most hotly debated questions in philosophy of biology Lively head-to-head debate format sharply defines the issues and paves the way for further discussion Includes coverage of the new and vital area of evolutionary developmental biology, as well as the concept of a unified species, the role of genes in selection, the differences between micro- and macro-evolution, and much more