Specifically, the researchers looked at genes crucial to survival, such as those responsible for the machinery that cranks out RNA, because they act like evolutionary clocks, mutating predictably over time (ScienceNOW, 27 February). (sciencemag.org)
Or if we were to turn back the evolutionary clock two billion years and reconstruct the «primordial soups» from which the molecules of life were fashioned, we would have no guarantee that eventually there would have been fish, reptiles, birds, monkeys, or... humans. (religion-online.org)
Were we to turn the evolutionary clock back to any point in the past, and let it run again, the outcome would be different. (newscientist.com)