Question

why are the bones in the fused?
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Answer 1

Answer:

You're absolutely right. Babies are born with about 300 bones, while adults only have 206. As babies grow into young adults, these bones fuse together to become single bones

Explanation:

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Answer 2

Answer:

The vertebrae of the cervical, thoracic, and lumbar spines are independent bones and generally quite similar. The vertebrae of the sacrum and coccyx are usually fused and unable to move independently. Two special vertebrae are the atlas and axis, on which the head rests.