Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
5.2
Points
0.5
Fiction/Nonfiction
Nonfiction
Word Count
2184
Points per Word
0.000229
Page Count
32
Points per Page
0.015625
Description
This book is about the plantlike animals that inhabited ancient seas and were the early relatives of sea urchins and sea stars.