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Concentration of oxygen in the atmosphere

Debate and discussion of any biological questions not pertaining to a particular topic.

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Concentration of oxygen in the atmosphere

Postby flopsei » Thu Nov 22, 2012 5:14 am

so i've heard around 300 million years ago, when insects had wingspans meters long, the concentration of oxygen in the atmosphere was around 35%

but I've also heard at about 25% oxygen a firestorm across continents could be ignited

are these both correct and does anyone else see a problem?
flopsei
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