Simple life could exist during the early days of Earth, but that would be even simpler than the single celled organisms we have today, and thus you shouldn't expect to find any "oddly shaped skulls" from that period. If we do find that, we should start preparing for an alien invasion, cause that'd guarantee we are not alone in the universe.
Quote:To know yet to think that one does not know is best; Not to know yet to think that one knows will lead to difficulty.
- Lau Tzu
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