Verticle and horizontal movement of the tetrapod skull (nodding and tilting) are

Question

Verticle and horizontal movement of the tetrapod skull (nodding and tilting) are made possible by the specicalized first and second cervical vertebra, known as the _________ and __________

Fish vertebrate typically have two or more central elements, which allow greater ___________. However, terrestrial vertebrates appeaer to have independatly reduces either intracentra or pleurocentra to create one central element per segement of vertebrate which reduces _____(same as previous blank)_____ but provides greater ___________________.

Explanation / Answer

1.the first vertebrae is called ATLAS , second vertebrae is called AXIS for nodding and tilting

2. they have two or more vertebrae elements which allow greater fexiblility for movement in the water , errestrial vertebrates appeaer to have independatly reduces either intracentra or pleurocentra to create one central element per segement of vertebrate which reduces _____(same as previous blank)_____ but provides greater support for movement

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