As conditions become more abrasive, shark teeth become a better choice ... “Continuing to run a trencher with worn teeth only puts wear and tear on the rest of the trencher and eventually ...

Getty Images Does it freak anyone else out that we know so little about the ocean? Although it covers about 70 percent of our ...

These teeth occur in the fossil record between 15 million and 2.6 million years ago. Because sharks shed their teeth throughout their lifetimes and leave bite marks on escaped prey, it would be ...