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? site of a series of battles during World War I. They arrive at a field of red poppies, which grew throughout the wastelands of battles fought during the war, and which serves as a marker for the Ypres battle site. Linus then recites the poem "In Flanders Fields", after directing the group to the British field dressing station where McCrae was inspired to write the poem. They come away realizing what the impact of the wars were, and how important the sacrifice of the soldiers was. Standing among the field of red poppies, Linus then turns and asks, "What have