Final answer:
The phases of cellular respiration that are aerobic and require oxygen include Pyruvate oxidation, the Citric Acid Cycle (Krebs cycle), and the Electron Transport Chain (ETC). The correct option is B) Pyruvate oxidation
Step-by-step explanation:
In cellular respiration, the phases classified as aerobic, meaning they require oxygen, include B) Pyruvate oxidation, C) Citric Acid Cycle (Krebs cycle), and D) Electron Transport Chain (ETC).
Glycolysis (A) is considered an anaerobic process and does not require oxygen. It occurs in the cytoplasm of cells. In contrast, pyruvate oxidation, the Citric Acid Cycle, and the Electron Transport Chain all occur within the mitochondria where they utilize oxygen to help convert energy into ATP.
Oxidative phosphorylation is part of metabolic processes tied to the ETC that generates the most ATP, using the energy from electrons transferred from NADH and FADH2. The correct option is B) Pyruvate oxidation