B : trachea and bronchi
The trachea is the largest airway.
The trachea separates into two smaller airways: the left and right bronchi, which lead to your two lungs.
1.) In any case you should be readying the ingredients in things you use. I’ve heard pros & cons of baby powder.
Answer:
They produce chemicals to fight infection and later produce chemicals to “turn off” the immune system. ( third choice)
