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In this scenario I think the largest mammals will go first? Like if you consider there was a higher concentration of oxygen during the dinosaur era and some dinosaurs were really big. So it seems larger mammals might need a higher concentration of oxygen.
In this scenario I think the largest mammals will go first? Like if you consider there was a higher concentration of oxygen during the dinosaur era and some dinosaurs were really big. So it seems larger mammals might need a higher concentration of oxygen.