Question

Explain Briefly all the following ​

Answer 1

Answer:

A vertebrate is an animal that has a backbone and a skeleton. Vertebrate animals include humans. When you think about vertebrates, think about bones: this word has to do with animals that have a lot of bones, in the form of a skeleton. ... Animals without a backbone are called invertebrates.

Tetrapods pertain to the vertebrates having four limbs or leg-like appendages. In taxonomy, these animals belong to the superclass Tetrapoda. The superclass Tetrapoda includes the amphibians, reptiles, mammals, and birds. ... The tetrapods acquired limbs that provided mechanical support on land

Explanation:

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Answer 2

Answer:

The spine is composed of 33 bones, called vertebrae, divided into five sections: the cervical, thoracic, and lumbar spine sections, and the sacrum and coccyx bones. The cervical section of the spine is made up of the top seven vertebrae in the spine, C1 to C7, and is connected to the base of the skull.