One thing that evolutionists are at a loss to explain is the origin of reptiles. Between the various classes of reptiles, such as snakes, alligators, turtles and lizards, there are strict boundaries. The fossil record shows that each of these categories has come into existence at once, with very different physical characteristics. One of these proofs to deny that reptiles underwent evolution is the 50-million-year-old snake fossil shown in the picture.