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In one or two sentences, summarize what happens during each of the two stages of cellular respiration?

Since this is not my area of expertise, I searched Google under the key words "cellular respiration stages" to get these possible sources:

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.

During the first stage of cellular respiration, called glycolysis, glucose is broken down into two molecules of pyruvate and a small amount of ATP is produced. In the second stage, pyruvate enters the mitochondria where it is further broken down in a series of reactions called the Krebs cycle and the electron transport chain, resulting in the production of a large amount of ATP.