This book is part of a book series called Reading Essentials in Science-Human Living Systems .

This book has been graded for interest at 10-13 years.

There are 40 pages in this book. This book was published 2007 by Perfection Learning .

Glen and Karen Bledsoe are teachers and freelance writers who have written several Lowell House Classics. Barbara Kiwak's credits include Classic Mysteries, Classic Vampire Stories and Creepy Classics.