The first organisms on earth may have been chemoautotrophs i

The first organisms on earth may have been chemoautotrophs in which the citric acid cycle operated i… Show more The first organisms on earth may have been chemoautotrophs in which the citric acid cycle operated in reverse to “fix” atmospheric CO2 in organic compounds. Complete a catalytic cycle that can begins with the hypothetical overall reaction succinate + 2CO2 → citrate. • Show less

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