Terry takes the body of the snakelike organism and slices it open along its dorsal side. If it is a hagfish, what should Terry see?
A) a well-developed series of bony vertebrae surrounding the spinal cord
B) a well-developed series of cartilaginous vertebrae surrounding the spinal cord
C) a tube of cartilage (surrounding the notochord) with dorsal projections on both sides of the spinal cord
D) a notochord, located underneath the spinal cord
Answer: D
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