Question

Imagine if your back bone was a long bone instead of a series of small bones. What would happen?

Answer 1

you could not bend your back and you will have decreased mobility for example could not run easily

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Answer 2

Our backbone is made of many small pieces .
Because of this , we can bend Our back.
When we bend , the small pieces helps it to stable.

Instead of having a backbone linked by many small pieces ,if we had a single long bone , we couldn't bend