Which of the following is an unpaired bone?

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(C) The correct answer is $C$. The sphenethmoid is an unpaired bone located in the skull of certain vertebrates,such as frogs. In the tadpole larva,th

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Sphenethmoid

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(C) The correct answer is $C$. The sphenethmoid is an unpaired bone located in the skull of certain vertebrates,such as frogs. In the tadpole larva,the cranial segment is cartilaginous,but during development,it ossifies into a single,tubular bone known as the sphenethmoid. Other options like premaxilla,pro-otics,and pterygoid are paired bones found in the skull.

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