A) mammary glands, hair, gill cleft
B) notochord, gill-cleft, dorsal tubular nervous system
C) notochord, vertebral column, gill-cleft
D) dorsal tubular nervous system, vertebral column, scales
Correct Answer: B
Solution :
Notochord or chorda dorsalis, dorsal tubular nerve cord and branchial gill cleft are present at any stage of life.
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