In which of the following vertebrate, the cranium and vertebral column are cartilaginous?
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a
Pterophyllum
b
Psittacula
c
Petromyzon
d
Pteropus
answer is C.
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Detailed Solution
Cranium and vertebral column are cartilaginous in the members of class-Cyclostomata. Petromyzon is a cyclostome.Pterophyllum is a bony fish. Psittacula is a bird. Pteropus is a mammal. Bony fishes, amphibians, reptiles, birds and mammals have bony cranium and vertebral column.