Which stage in cellular respiration evolved first?

Question

Quizplus · Accepted Answer

Glycolysis is considered to be the oldest and most primitive form of cellular respiration. It is an anaerobic process, meaning it does not require oxygen, and is found in both prokaryotic and eukaryotic cells. The other stages of cellular respiration, such as the Krebs cycle and electron transport chain, require oxygen and are found only in eukaryotic cells. Fermentation can occur in the absence of oxygen, but it is not considered a part of cellular respiration.

Which Stage in Cellular Respiration Evolved First