Question

what do you think would have happen if the back bone had only one long bone instead of many small bones

Answer 1

we cannot sit properly.we cannot do some work properly

Answer 2

$\huge\purple{Ello \: ♡}$

The structural composition of back bone allows us to bend, crouch, stand and lie down on the ground. The vertebral units promote this movement. If back bone is made up of one long bone then we would never be able to sit, crouch or lie. One single bone means no flexibility in the structure of a bone.