Eras of Life & Mass Extinction

You can't talk about the history of life on earth without acknowledging the great mass extinctions between them. It's Okay to Be SMART takes us through these 5 (or 6) Mass Extinctions.

One of the causes of Mass Extinctions is when the Continents move and connect groups of life that have been separated for millions of years. The idea the continents move has only recently been accepted because it took a long time to find the evidence that they do.

Sometimes organisms survive the Mass Extinctions complete with adaptations that no longer make sense in their new world. These Ghosts of Evolution give us hints about ancient life.