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? 1) First line of defense 2) second line of defense 3) third

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?

1) First line of defense
2) second line of defense
3) third line of defense
4) fourth line of defense

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