There are 128 pages in this book. This book was published 2002 by Sterling Juvenile .

Michael A. DiSpezio conducts workshops for teachers throughout the world. He has co-authored more than two dozen science textbooks and has worked for clients such as the Discovery Channel and MTV. Rob DeSalle is a curator in the Sackler Institute of Comparative Genomics at the American Museum of Natural History. He works on molecular evolution, conservation genetics and evolutionary genomics of a wide array of life forms ranging from plants to all kinds of insects, reptiles and mammals.