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
United We Stand: What More Can I Give this was because Jackson signed a contract with CBS (the former owner of his record label) over the 30th Anniversary Special to not appear under his name in any other program; the airing of "Man in the Mirror" at an awards ceremony was also canceled. John Stamos hosted the event, and appearances were also made by celebrities including Kevin Spacey along with political figures such as the mayor of Washington, D.C.. United We Stand: What More Can I Give United We Stand: What More Can I Give was a benefit concert led by Michael Jackson held on October 21, 2001