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Larry is taking a walk in the park. The pollen in the air makes him sneeze constantly. What line of defense is his immune system exhibiting?

Respuesta :

I think it is first line of defense. 
The line of defense that is his immune system exhibiting is the first line of defense. The first line of defense are a combination of physical and chemical barriers that prevent all types of foreign agents from penetrating the outer layer of the body. In this case, it is the nasal cavity.

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