Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
7.3
Points
1.0
Fiction/Nonfiction
Nonfiction
Word Count
7687
Points per Word
0.00013
Page Count
32
Points per Page
0.03125
Description
This book charts the evolution of living species from 2.5 billion years ago, through the Triassic, Jurassic, and Cretaceous periods and to today. The coauthor is David West.