Ediacaran organisms preceed the Cambrian Explosion. Note how simple they are in the pictures shown. Frond forms, very simple. So how do we explain the enormous complexity in the Cambrian. Increasing oxygenation is a small answer, not anything complete. How did the presence of more oxygen cause that huge jump in complexity? Darwinism has no answer.-http://www.nature.com/nature/journal/v470/n7334/full/nature09810.html?WT.ec_id=NATURE-20110217