Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
6.1
Points
1.0
Fiction/Nonfiction
Nonfiction
Word Count
6695
Points per Word
0.000149
Page Count
48
Points per Page
0.020833
Description
This book discusses how the respiratory system is designed to bring essential oxygen into the body and remove useless carbon dioxide. The body's cells need oxygen to change nutrients from food into the energy they need to perform their jobs.