OXYGEN AS A PROBLEM
highly reactive; oxidises organics to CO2
O2-, OH-, H2O2 seriously disruptive
O2 -> O3, which screens UV;
this further reduces production of organics
selection for new metabolic styles
and ways of dealing with free O2
catalases, peroxidases to convert free radicals
USE O2 to oxidise organics - respiration
fermenting - 1:18 - respiring
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