Wodering if it was related to oxygen levels in the atmosphere or something else?
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It’s less about the oxygen levels, and more about the CO2 levels. High CO2 levels and warm temperatures made for plenty of plant life, so larger bodies had enough food to consume to maintain larger bodies. Given enough food, a larger body is advantageous for defensive purposes (and also mating, if you can fight off other suitors) so it gets selected.
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