Submitted by Xerrostron t3_xtuh86 in askscience
knotacylon t1_iqvi1ke wrote
Reply to comment by kittenTakeover in How much does the size of an animal impact whether it is cold or warm Blooded? by Xerrostron
That's true, I forgot about that. That's why insects and other arthropods were bigger when the earth had a higher amount of O2 in the atmosphere and shrank when the O2 levels dropped.
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