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Unit 31 Immune System
- 12. KEY CONCEPT The immune systems consists of organs, cells, and molecules that fight infections.
- 17. KEY CONCEPT The immune system has many responses to pathogens and foreign cells.
- 25. KEY CONCEPT Living in a clean environment and building immunity help keep a person healthy.
- 31. KEY CONCEPT An overactive immune system can make the body very unhealthy.
- 37. KEY CONCEPT When the immune system is weakened, the body cannot fight off disease.