1. In order for multi-cellular life to take hold, the heavy bombardment had to stop, water had to form, the temperature had to cool, and the atmosphere had to allow for it.
2. I believe that the Proterozoic Era was the most important in terms of the development of the Earth because oxygen began filling the atmosphere and multi-cellular organisms formed, laying the ground work for human existence.
3. I believe that the presence of humans is very insignificant in context of the entire history of the Earth. Out of the estimated 4.5 billions years that Earth has been alive, humans have only been existent for a very short time, barely a blink of an eye in the whole scheme of things.
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