Nitrox in Nature
Sometime in the geologic past the Earth's atmosphere contained much more than 20% oxygen: e.g. up to 35% in the Upper Carboniferous. This let animals absorb oxygen more easily and influenced evolution.
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“Things admit of being used as symbols, because nature is a symbol, in the whole, and in every part.”
—Ralph Waldo Emerson (1803–1882)
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