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that information is interesting. imagine all the endless 'dangers' of living in the bronze age to where the average life expectancy would be 18. humans become soo much more irrelevant every single day.
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Acid is like swimming... if you cant swim, why would you go to the deep end?
For example mammaliformes ("almost mammals") and then mammals existed throughout the reign of the dinosaurs, but could not compete for the large terrestrial vertebrate niches which dinosaurs monopolized. The end-Cretaceous mass extinction removed the non-avian dinosaurs and made it possible for mammals to expand into the large terrestrial vertebrate niches.
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