We always hear about how big ancient sharks, alligators, birds were. What was the advantage of being such a massive size and what caused them to become smaller? To my understanding its best to be smaller because of the square-cube law, then why are there exceptions like whales?
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Yes it’s been mentioned here, but I’d always heard that the key thing that allowed for larger animals was a higher concentration of oxygen in the atmosphere–allowed for much larger creatures without needing way better circulation to go along with the size, etc. Bigger plants too.
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