The short answer: heredity. Just as you inherit other characteristics of your parents (she has her father’s eyes), you inherit genetic instructions that determine physical aspects such as the size and shape of your jaw. Sometimes people with narrow jaws…
Monthly Archives: March 2013
The first teeth were outside the mouth. Paleontologists (people who study fossils) have presented evidence that the first teeth were specialized scales, appearing on shark-like fish around 400 million years ago. These pointy scales were positioned around the lips, where…
