The axial endoskeleton of Elasmobranchs is made up of

Cartilage

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Ossified cartilage

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Bone

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Hyaline cartilage

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Solution

The correct option is A Cartilage
The endoskeleton or internal skeleton includes the axial skeleton with skull or cranium and the vertebral column and the appendicular skeleton which supports the fins. Its consists of cartilage. The cartilaginous endoskeleton of embryonic elasmobranchs persists into the adulthood and it is not replaced or supplemented by plates of endochondral bone as in other Gnathostomes. Hence, option A is correct.

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