At birth, the spine consists of 33 bones, 9 more than an adult. What happens to these extra bones?

Answer - Many baby bones will fuse together, which means the number of bones will decrease. The space that separates the ends of two bones that eventually fuse is also cartilage, this allows us to grow and help out bones get stronger.
example ; like the tissue you have in the tip of your nose

Ithink it would be a and b