Answer the following question given this paragraph: 

In the chest, the trachea divides as it enters the lungs to form the right and left bronchi . The bronchi contain cartilage, which prevents them from collapsing. Mucus in the bronchi traps any remaining particles in air. Tiny, hair-like structures called cilia line the bronchi and sweep the particles and mucus toward the throat so they can be expelled from the body.


Q: In the chest, the trachea divides as it enters the lungs to form the right and left what?


A:
bronchi