(1) Air in the atmosphere would have had to be there for animals to survive. Also weather that could support life. And lets not forget food or the thing we can't survive without.
(2) The Archaean eon because that is the eon when the earth is forming. But if the earth didn't form nothing would be here. So the Archaean is the most important period.
(3)The human existence is not very significant. We are only a small part of the history of earth. For example if you had a 4.5 meter long paper with each meter representing a billion we would be a very very small part of the paper.
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