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 You Have Left one since the pilot." Teresa L. of TV Fanatic rated the episode 4 out of 5 stars and stated, "Slow and somber, 'What You Have Left' was gently moving and highly intriguing. The episode matched others in its pacing, but the cliffhanger ending was a good change for the show." The episode was watched by 1.81 million viewers, marking the series lowest ratings to date. What You Have Left "What You Have Left" is the sixth episode of the American television drama series "The Killing", which aired on May 1, 2011 on AMC in the United States. The episode was