There was a time when giant insects ruled the skies and it corresponded to high oxygen levels.After the evolution of birds, about 150 million years ago, insects got smaller - despite rising oxygen levels. What gives?Insects reached their biggest sizes about 300 million years ago during the late Carboniferous and early Permian periods.
Why were prehistoric insects so big?
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Scripps Student Spotlight: Dante Capone | Scripps Institution of Oceanography
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Social networking for fossils reveals community impacts of mass extinctions
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