Below: Viewed from inside the mouth, the lower part of this jaw bone is missing, which reveals new teeth growing and pushing up to replace the old ones. This renewal was a continuous process. The teeth have sharp ridges for grinding plant matter.
Below: Viewed from inside the mouth, the lower part of this jaw bone is missing, which reveals new teeth growing and pushing up to replace the old ones. This renewal was a continuous process. The teeth have sharp ridges for grinding plant matter.