Name the three stages of cellular respiration.

The stages of cellular respiration comprise three key processes: Glycolysis, the Krebs cycle, and the Electron Transport Chain.

Glycolysis occurs in the cytoplasm and is the initial step where glucose is broken down into pyruvate, producing a small amount of ATP and NADH. This stage can occur with or without oxygen, making it an anaerobic process that sets the stage for further energy production.

Following glycolysis, if oxygen is present, pyruvate enters the mitochondria to undergo the Krebs cycle (also known as the citric acid cycle). During the Krebs cycle, acetyl-CoA derived from pyruvate is further oxidized, generating more electron carriers in the form of NADH and FADH2, along with ATP and carbon dioxide as a byproduct.

The final stage is the Electron Transport Chain, located in the inner mitochondrial membrane. Here, the high-energy electrons from NADH and FADH2 are transferred through a series of protein complexes, leading to the production of a significant amount of ATP through oxidative phosphorylation. Oxygen serves as the final electron acceptor, forming water.

The other options include stages that are not part of the primary pathway of aerobic cellular respiration. For instance, fermentation is an anaer