640 million years ago: The Origin of Multicellular Life. The Marinoan Glaciation. 580 million years ago: Appearance of Ediacaran Fauna. The Gaskiers Glaciation. 550 million years ago: Evolution Responds to Environmental Changes. 540 million years ago: The First Cambrian Organisms. In order to survive the repetitive periods of extreme cold and extreme heat, life evolved into a symbiotic body of multiple lifeforms, and the Ediacaran and Cambrian fauna and flora emerged. In the evolution of these organisms, the Stem evolution occurred along the continental breakup area, which encouraged the creation of a new species. Meanwhile, in the continental collision zone, the Crown evolution progressed, resulting in the explosive diversification of species.