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Originally Posted by spacecowboy
Faster delivery system, again it’s the quantity and not the concentration. At 30% you will begin to lose your eyesight and get light headed.
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Because humans are evolved for an approximate 21% concentration of oxygen. Your point?
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All beings would have had to of evolved with there always being 21% oxygen. That just couldn't happen with so many random occurrences need in Darwinian theory’s.
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Then you obviously don't understand evolution. The Earth, in the past 1.5 billion years, has had an oxygen concentration between 15% and 30%, varying because of various biological, chemical, and geological processes. At this epoch of history, it's 21%. That's where the various factors reach equilibrium.
You have yet to really refute any part of evolutionary theory. You're just going around saying, "but it cudnt hapen like that becuz it cudnt." Have you ever taken a highschool science course? If so, did you pass? Did you pass without cheating? If so, I'd like to have words with your teacher for doing a ****ty job.