Near Death Animal Encounters are pretty scary for these people. Unfortunate events are Scary Animal Close Calls.
A so-called "snowball Earth" is a geological event where the entire surface of the Earth is covered in snow and ice. The most recent snowball Earth took place during the Cryogenian period and consisted of 2 global glaciation events known as the Sturtian and Marinoan glaciations. It is possible that between the period of time known as the "Boring Billion" and the Snowball Earth, simple life could have had time to innovate and evolve which could later lead to the evolution of so-called multicellularity.
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