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I've been struggling with trying go figure out the Dimension X air situation, mostly regarding the Neutrinos.
Utroms clearly need air that is much thinner than what present-day Earth has, probably something like 10-13% oxygen levels 470 million years ago. It could be argued that Utroms would need more oxygen, except that Earth life could do just fine, if not better, with more oxygen, at 35% as in the Carboniferous period. We'd just have to put up with more fires and huge insects, but otherwise, be more energetic. Our 23% oxygen doesn't do Utroms well at all, and 35% would probably mean instant death.
I would assume Neutrino has oxygen levels similar to Earth's, otherwise the turtles and Rock Soldiers wouldn't be able to breathe there.
So why are the Neutrinos able to breathe in multiple different atmospheres while others cannot?
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