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 They Doing in Heaven? What Are They Doing in Heaven? "What Are They Doing in Heaven?" is a Christian hymn written in 1901 by American Methodist minister Charles Albert Tindley. , it has become popular enough to have been included in 16 hymnals. The song has sometimes been recorded under the titles "What Are They Doing?" and "What Are They Doing in Heaven Today?". The question mark is often omitted. The song may also be known by its first line, "I am thinking of friends whom I used to know". The song consists of four verses and a refrain, each four lines long. In