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Re: Mesozoic birds made insects shrink
Also, hasn't the link between hyperoxia and arthropod size been only
I have no idea how quickly you could establish selective pressure
towards larger sizes...
And it's not like we don't have massive terrestrial arthropods today
with our middling O2 levels, it's just that they're rather rare:
But that's a crab. It doesn't breathe the way insects do. Insects are
(probably) limited by diffusion and thus by O2 levels. Crabs, and
spiders for that matter, aren't.