Biology

The primary role of oxygen in cellular respiration is: To act as the final electron acceptor.

In cellular respiration, oxygen plays a critical role in the electron transport chain, which is the final stage of respiration. At the end of the chain, oxygen accepts electrons and combines with protons (H+) to form water (H₂O). This step is essential because it helps maintain the flow of electrons through the chain and enables the continuation of ATP production.

The other options are incorrect:

To break down glucose: Oxygen does not break down glucose directly; gl...