Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
4.4
Points
1.0
Fiction/Nonfiction
Nonfiction
Word Count
4028
Points per Word
0.000248
Page Count
48
Points per Page
0.020833
Description
This Freestyle Express edition describes the parts of the body that defend against illness, such as skin, hair, white blood cells, and lymph fluid, discussing the workings of the immune system.