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I think the experience of "invasive species" from the last few centuries prove that there were no civilization that made regular trips between the continents fo
by BurningFrog 4y ago
I think the experience of "invasive species" from the last few centuries prove that there were no civilization that made regular trips between the continents for a few dozen million years.
- edgyquant 4y agoOr they were better at keeping them separate than us.
- deleted 4y ago[deleted]