biology's big "explosion"

reference:
http://www.sciencenews.org/view/generic/id/336480/title/Biology%E2%80%99s_big_bang_had_a_long_fuse

summery:
an effort to date the early evolutionary history of modern animals show that it took a long time for evolution to really get started. the last common ancestor of today's animals is predicted to have arose about 800 million years ago. but todays major animal groups apeard 200 million years later. at that time there was a burst in animal divesity called the cambrian explosion. just what happened in the cambrian explosion is still unknown. what kevin peterson belives is that the reason that this happened is because “You see an evolutionary explosion, if you will, because animals are eating other animals for the first time”.

critique:
i thought this was interesting because i have never heard of the camdrian explosion

impact:
it will help us understand our origins and genetic history.