When you yawn air enters the body through mouth or nose from there it passes the?

The correct answer is Trachea.

When a person yawns, air enters the body through either the mouth or the nose. From there, it passes through the pharynx, which is the back of the throat, and then into the trachea, which is the windpipe. The trachea is a tube that carries air to and from the lungs.