this post was submitted on 13 Jul 2025
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Was curious so I tried to find historical Oxygen levels by century (didn't find that). With the current oxygen level being around 20.9% and decreasing to effectively 17% around a mile in altitude, (say Denver) we adapt to 4% oxygen level without death. So if dinosaurs are similar in breathing to humans, I'd say with no scientific backing beyond just speculation, they should be fine.