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12. The system in our body which is responsible for fighting off pathogens. (3 Points)
Immune system
Endocrine syetem
Excretory system
O Cardiovascular system
Skeletal system
Muscular system
经
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12. The system in our body which is responsible for fighting off pathogens. (3 Points)
Immune system
Endocrine syetem
Excretory system
O Cardiovascular system
Skeletal system
Muscular system
经
74°F Sunny