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The Carboniferous period (roughly 359 to 299 million years ago), when high atmospheric oxygen levels (30-35%) allowed arthropods to reach massive sizes.

The Carboniferous period (roughly 359 to 299 million years ago), when high atmospheric oxygen levels (30-35%) allowed arthropods to reach massive sizes.
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[–] • 1 pt

I fucking hate bugs. Mosquitos here are already the size of eagles.