eventually, use of sunlight energy evolved
PHOTO-AUTOTROPHY
but first forms, probably still O2-intolerant,
used H2, H2S etc. as reducing agents for CO2
we think of photosynthesis as generating O2
2H2X + CO2 -> CH2O + 2X + H2O
use of water + sunlight a stunning technique
massive consequences for earth's
atmosphere and its life......
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