The citric acid cycle is believed to have developed fairly recently in the evolution of cellular life.

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The citric acid cycle, also known as the Krebs cycle or the tricarboxylic acid cycle, is a central metabolic pathway found in most living organisms, including bacteria and eukaryotes. It is believed to have evolved very early in the history of life, possibly before the emergence of oxygen-producing photosynthesis.

The Citric Acid Cycle Is Believed to Have Developed Fairly