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What do you do for a living? http://silverdaddies.fun/ silver daddies  Aside from this, another potential bottleneck may have been the levels of molecular oxygen available within the Earth’s earliest atmosphere. A recent study by Erik Sperling and his colleagues, based at Harvard University, looked at current environmental locations that replicate the conditions on Earth prior to the Cambrian Explosion. The regions contain little oxygen and, as a consequence, few to no carnivores dwell here.