- Apr 17, 2006
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The first CO2 breathers changed the environment to the point of creating banded formations in metal ores.Better at manipulating the environment...on a global scale?
It made for a cyclically destructive environment... but it also created a niche for O2 breathers to develop. Without O2 there'd be no animals, and thus no humans.
(EDIT, just to clarify, this was a completely mindless action, not a deliberate attempt to change the environment).
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