Scientists Have Revived Tiny Organisms That Were Frozen During The Late Pleistocene Epoch. The Creatures, Known As Bdelloid Rotifers Or Wheel Animals, And Said To Have Existed For About 50 Million Years, Were Frozen In The Arctic For 24,000 Years. The Organisms, Once Thawed, Began Reproducing Asexually, Creating Clones That Were Their Genetic Duplicates.