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Q&A How early was the Earth liveable for today's humans?

Say you were to drop a (bunch of) human(s) at some past era of our Earth. I'm assuming they might encounter a few problems such as the composition of the air not being breathable, the water being t...

3 answers  ·  posted 10y ago by Sheraff‭  ·  last activity 9y ago by Sheraff‭

Question biology humans earth habitability