A) Vertebral column
B) Notochord
C) Dorsal tubular nerve cord
D) None of these
Correct Answer: A
Solution :
Vertebral column is not found in all chordates. The notochord remains throughout life in some chordates e.g., some protochordates in vertebrates it is found in embryo only, however in the adult it is replaced by a vertebral column (Backbone).
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