My noob understanding of this article: Multi-cellular life split into plants and animals ~800myo, during the Avalon Explosion. Science has long assumed high c

My noob understanding of this article: Multi-cellular life split into plants and animals ~800myo, during the Avalon Explosion. Science has long assumed high concentration of oxygen predates animals. But researchers have now determined that oxygen levels were far lower than thought necessary when evolution of animals started to really take off. So now we must come up with new theories for origins and evolutionary explosion of animals.