What material (food/air) frog trachea transport? for a frog

the trachea is part of the windpipe providing a passageway for inhaled air from mouth and nostrils to lungs. It constitutes an essential component of a frog's respiratory system and connects the glottis to the lung alveoli.

The trachea is a hollow tube that lies directly behind the esophagus. It extends down the mid-line of the body and connects to the bronchi of each lung. The trachea delivers air from the mouth and nose into the bronchi for the lungs to expand. While eating, the trachea is covered by the epiglottis to prevent food from entering the trachea and the lungs.

Ibelieve z is the second because it looks like tissues, where has y is first because it's a cell, and the others look like organs or body parts.