In this defense system, protective skin structures doubled as environmental sensors. “We performed experiments on modern fish that confirmed the presence of nerves in the outside teeth of ...

Your skin also goes through some changes as you grow ... Stop and think: Our baby teeth fall out and are replaced by newer adult teeth, which we will have for the rest of our lives.

These do have true dentine – in odontodes on their skin. Haridy says ... structures that became teeth,” says Fraser. Receive a weekly dose of discovery in your inbox! We'll also keep you ...