Anewborn baby has 300 bones and a adult has 206 bones, how many bones does a 13 year old have

A 13 year old child has 206 bones because the child’s bones has fused together.

The 300 bones of a child are actually one bone, which is split into two ends via underdeveloped cartilage as well as infused sutures. But near puberty most sutures fused, and the long bones have had the cartilage become actually bone. So on average the safest answer is 206.

However because in medicine and just overall human anatomy nothing is a for some sutures or bones may not have fused, the child may still have several more than what they are supposed to.

Answer d would be the best answer, for he wants to have part in biotechnology. an ekg technician is quite similar.