Reading Metrics
Grade Level
Upper Grades (UG 9-12)
Book Level
12.6
Points
33.0
Fiction/Nonfiction
Nonfiction
Word Count
148046
Points per Word
0.000223
Page Count
512
Points per Page
0.064453
Description
This book traces the development of primitive societies, showing why some groups advanced more rapidly than others and how this progression explains why various populations stabilize at specific phases of development while others continue to evolve.