Chordate of the three subdivisions of chordates, all have distinct skulls. They include the hagfish, which have no vertebrae. Michael J. Benton commented that "craniates are characterized by their heads, just as chordates, or possibly all deuterostomes, are by their tails". Most craniates are vertebrates, in which the notochord is replaced by the vertebral column. These consist of a series of bony or cartilaginous cylindrical vertebrae, generally with neural arches that protect the spinal cord, and with projections that link the vertebrae. However hagfish have incomplete braincases and no vertebrae, and are therefore not regarded as vertebrates, but as members of
What Are Words What Are Words "What Are Words" is a hit song written by Rodney Jerkins, Andre Lindal and Lauren Christy, and performed by American singer Chris Medina. It was released on February 25, 2011, the day after his surprising elimination on the reality TV show American Idol. The song is a tribute to his fiancée who suffered a brain injury as the result of a car wreck and is about promises, commitment and keeping your word. The music video was shot at Atlantis studios in Hollywood and was released days after the single. The video depicts Medina in the actual recording