Trachea act as a resonator to amplify sound. In some birds, the tracheal rings are complete, and may even be ossified. In amphibians, the trachea is normally extremely short, and leads directly into the lungs, without clear primary bronchi. A longer trachea is, however, found in some long-necked salamanders, and in caecilians. While there are irregular cartilagenous nodules on the amphibian trachea, these do not form the rings found in amniotes. The only vertebrates to have lungs, but no trachea, are the lungfish and the "Polypterus", in which the lungs arise directly from the pharynx. The word "trachea" is used to
Less Commonly Taught Languages Less Commonly Taught Languages Less Commonly Taught Languages (or LCTLs) is a designation used in the United States for languages "other than" the most commonly taught foreign languages in US public schools. The term covers a wide array of world languages (other than English), ranging from some of the world's largest and most influential languages, such as Chinese, Russian, Arabic, Hindi, Portuguese, Japanese, Persian, and Turkish, to smaller regional languages studied in the US mainly by area experts, such as Twi, spoken in West Africa, and Finnish. The term arose out of a need to contrast the more commonly taught