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 Have We Learned, Charlie Brown? What Have We Learned, Charlie Brown? What Have We Learned, Charlie Brown? A Tribute is the 26th prime-time animated television special based upon the comic strip "Peanuts," by Charles M. Schulz, who introduced the special. It originally aired on the CBS network on May 30, 1983, Memorial Day in the United States, and one week prior to the 39th anniversary of the D-Day Invasion. It aired on CBS only one other time, on May 26, 1984, which was the Saturday before Memorial Day, and ten days prior to the 40th anniversary of the D-Day Invasion. The special directly follows the