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| "It's called Oxygen. Way better than steroids." |
Geologic research indicates a "pulse" occurred in the concentration of environmental oxygen during the Paleozoic era. In plain language, there was a lot more oxygen in the atmosphere 300 million years ago than there is today--roughly 35%, almost double the present-day level of 21%.
The rise and fall of atmospheric oxygen also coincided with the evolution and extinction of giant insects. Some biologists have proposed this was more than just coincidence. They hypothesize that high oxygen levels could explain the existence of giant species. The extinction of winged monsters and gargantuan beetles after 100 million years may also be the result of decreased levels of oxygen that happened at the same time.
The rise and fall of atmospheric oxygen also coincided with the evolution and extinction of giant insects. Some biologists have proposed this was more than just coincidence. They hypothesize that high oxygen levels could explain the existence of giant species. The extinction of winged monsters and gargantuan beetles after 100 million years may also be the result of decreased levels of oxygen that happened at the same time.
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