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___33. In the evolution of the vertebrates, the osteocytes are important in the formation of the:...

___33. In the evolution of the vertebrates, the osteocytes are important in the formation of the: a) arthropods. b) CaPO4 skeleton. c) circulatory system d) skeleton of sharks and rays e) none of these are true.

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Answer #1

Ans- 33 b- CaPO4 skeleton

a) Arthropods are not vertebrates, and their skeleton is chitinous in nature.

c) not role in circulatory system

d) skeleton of sharks and rays is made up of cartilage not bone and osteocytes are present in bones.

b- This is because CaPO4 skeleton means bony skeleton and bones do consists of osteocytes cells. These cells produces the bone's matrix which consists mainly of CaP and calcium carbonate. As the vertebrates have evolved, their skeleton have evolved from cartilage to bony as they move further from the first vertebrate.

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