This book is part of a book series called The Science Behind .

This book has been graded for interest at 8-14 years.

There are 32 pages in this book. This book was published 2016 by Capstone Press .

STEPHANIE WATSON is an independent scholar who has written and contributed to numerous works, including World of Genetics and Science and Its Times . She is the author of The Urinary System , and coauthor of The Endocrine System , both in Greenwood's Human Body Systems series.