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:Oxygen is a critical component of Aerobic respiration in many animals. The reason why oxygen is so important is because it plays a crucial role in the mitochondria, the powerhouses of the cell. The mitochondria has two membranes. On the inner membrane, 4 groups of protein form the Electron Transport Chain.
aerobic process of respiration takes place only in the presence of oxygen, the role of oxygen is limited to the terminal stage of the process. Yet, the presence of oxygen is vital, since it drives the whole process by removing hydrogen from the system. Oxygen acts as the final electron acceptor. It accepts electrons from cytochrome a-a 3 and forms water molecule.
so option 4 is correct.
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