Submitted by Xerrostron t3_xtuh86 in askscience
kittenTakeover t1_iqu7xal wrote
Reply to comment by knotacylon in How much does the size of an animal impact whether it is cold or warm Blooded? by Xerrostron
Body size is affected by a lot of factors. One of the biggest is if they have active aspiration and circulation or passive aspiration and circulation. The more passive the more they benefit from thin bodies with high surface area ratios to absorb oxygen.
knotacylon t1_iqvi1ke wrote
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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