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
Facebook real-name policy controversy the acronym is employed, Facebook automatically changes to lower-case all letters except the first. (Use of periods, e.g. D.L.G., will result in a message telling users that "Profile names can't have too many periods.") Therefore, someone commonly known in real life by a name such as Mary De Leon Guerrero Mafnas would have to resort to using what on Facebook would end up being "Mary Dlg Mafnas". The message is not accompanied by an option to challenge/appeal the restriction or to send Facebook documentation that the format is how one normally formats their name in real life. In January 2015,