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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Famous quotes containing the word nature:
“See how peaceful it is here. The sea is everything. An immense reservoir of nature where I roam at will.... Think of it. On the surface there is hunger and fear. Men still exercise unjust laws. They fight, tear one another to pieces. A mere few feet beneath the waves their reign ceases, their evil drowns. Here on the ocean floor is the only independence. Here I am free.”
—Earl Felton, and Richard Fleischer. Captain Nemo (James Mason)