The larval dragon fly contains a trachaea on the rectum which serves as this structure.
The larval dragon fly contains a trachaea on the rectum which serves as this structure. Spiracles often guide movement through this structure in some cartilagenous animals, and these structures are often covered by a bony osculum. These structures make use of the (*) countercurrent exchange system to transfer oxygen to the blood, and they are sometimes used to describe the pharyngeal slits that chordates are born with. For 10 points, name these respiratory structures that enable fish to breathe.
The larval dragon fly contains a trachaea on the rectum which serves as this structure.
{gills}