The Immune System is a large network of cells, tissues, and organs that work together, acting like a fort with guards to keep out risky viruses and bacteria and destroy invaders.
Free downloadable Teacher\'s Guide available..
Full-color illustrations help readers visualize the Immune System at work.
Readers will learn how researchers are striving to improve the body\'s Immune System to fight off disease.
The Immune System is a large network of cells, tissues, and organs that work together, acting like a fort with guards to keep out risky viruses and bacteria and destroy invaders