Both aerobic respiration and anaerobic respiration utilize glycolysis, Krebs cycle, and an electron transport system, but in respiration, O₂ is the final electron acceptor at the end of the electron transport system, whereas in , an inorganic molecule other than O₂ is the final electron acceptor.

a. Aerobic respiration, b. Anaerobic respiration.

Explanation: Oxygen is an essential component for aerobic respiration because it is at the end of the electron transport chain, where it accepts electrons and picks up protons to give out water.

The final acceptor of electrons in the electron transport chain during aerobic respiration is oxygen.

The final electron acceptor in the Anaerobic respiration are inorganic molecules such as sulfates. Inorganic molecules are used rather than Oxygen.

Oxygen

AEROBIC RESPIRATION

ANAEROBIC RESPIRATION

Explanation:

Oxygen is the final electron acceptor in aerobic respiration so that the  steep gradient needed for the progression of Electron transport chain(ETC) will progress, to generate Proton Motive Force(PMF), for pumping protons across the intramemebranes. The influx of protons produce energy for ATPs synthase synthesis of ATP. Thus oxygen is not available to accept electon to form water with protons, the ETC will stop, chemiosomosis will stop, and aerobic respiration will seize.

However  in anerobic respiration,pyruvate or alcohol must accept electrons so that NAD+ could  be freed and returned to Glycolysis for anaerobic respiration to progress.  

Compound of Sulphate may also be  used.