Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
9.1
Points
3.0
Fiction/Nonfiction
Nonfiction
Word Count
13412
Points per Word
0.000224
Page Count
80
Points per Page
0.0375
Description
This book discusses the many different life forms that have existed on Earth, their importance, and how they have changed over time.