This is the first and only book, so far, to deal with the causal basis of evolution from an epigenetic view. By revealing the epigenetic "e;user"e; of the "e;genetic toolkit"e;, this book demonstrates the primacy of epigenetic mechanisms and epigenetic information in generating evolutionary novelties. The author convincingly supports his theory with a host of examples from the most varied fields of biology, by emphasizing changes in developmental pathways as the basic source of evolutionary change in metazoans. - Original and thought provoking--a radically new theory that overcomes the present difficulties of the theory of evolution- Is the first and only theory that uses epigenetic mechanisms and principles for explaining evolution of metazoans- Takes an integrative approach and shows a wide range of learning