Answer:
The stage happens in mitochondria.
Energy is released.
Explanation:
The second stage of cellular respiration is the Krebs cycle
In the first stage of respiration, called glycolysis, a molecule of glucose is broken down into two molecules of pyruvate. Therefore the option "Glucose is broken down" is wrong, as this happens in the first stage
Prior to the beginning of the Krebs cycle, pyruvate is converted into Acetyl CoA, and then enters the Krebs cycle, where it undergoes a series of reactions (oxidation) to generate CO2, and the NAHD, FADH2, and ATP. Therefore, it is true that energy is released (in the form of ATP)
The Krebs cycle occurs in the mitochondria (not the cytoplasm, there is where oxidative phosphorylation occurs).
I would also say that oxygen combines with small molecules best describes oxidative phosphorylation (or the electron transport chain), where oxygen acts as the final electron acceptor, and is reduced to water.
