what is the difference between notochord and vertebral column?
Notochord is the chief distinguishing feature of Chordates. It is a flexible rod-like structure which lies between the dorsal nerve tube and the gut. It is mesodermal in origin. It increases locomotory power and provide internal support. It supports the body in case of the lower chordates while in higher chordates (Vertebrates) it is present only during embryonic stages and after that it is replaced by a vertebral column. vertebral column is a bony structure made up of vertebrae and protects the spinal cord.
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