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_AlreadyTaken_ t1_iye3ql4 wrote

Reply to comment by dan_dares in How is O2 introduced to blood in the alveoli? by LemmeKermitSuicide

Which is why you got huge insects in periods of greater oxygen levels like during the Carboniferous.

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dan_dares t1_iye4so7 wrote

Yep the inherent limitation of spiracles..

But the alternative is 8 foot tall insects, so i'll take that.

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