61.   She assumed these genetic changes happen at a constant rate, and using a supercomputer she clocked the mutations back through time to a common ancestor.

62.   Some researchers say that if feathers developed from scales, then the new fossil is proof that birds and dinosaurs evolved independently from a common reptilian ancestor.

63.   That, in turn, could help people identify living relatives who share common ancestors.

64.   The basic pattern had some changes that apparently developed among people who once shared a common ancestor and then were isolated for many generations, Underhill said.

65.   The Chinese researchers who made the latest discovery believe the two creatures had a common ancestor.

66.   The two countries have common Latin ancestors and speak somewhat similar languages.

67.   However, the DNA tests made it certain that Sykes himself and several million contemporary Europeans shared a common ancestor.

68.   The Japanese and descendants of the Incas have a common ancestor, according to researchers who base their conclusions on similar genetic characteristics, the Mainichi Shimbun said Monday.