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 Might Have Been In this song, the narrator tells himself or his former romantic interest that he cannot change the past and that there is no way to know what their relationship could have become. The exact circumstances are left open-ended. Two music videos of the song, directed by Jack Cole, were filmed for the song. The first version, filmed entirely in sepia tone, focuses around World War II and shows a couple dancing just before the man has to go off to war. Old stock footage from the war is shown also. The second version features a man named Michael, who brings