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Which catabolic processes may have been used by cells on ancient Earth before free oxygen became available?only glycolysis and fermentationglycolysis, pyruvate oxidation, the citric acid cycle, and oxidative phosphorylation, using an electron acceptor other than oxygenonly oxidative phosphorylation, using an electron acceptor other than oxygenonly glycolysis and pyruvate oxidationonly glycolysis and the citric acid cycle

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