You are presented with the question "What is oxygen used as in respiration?" and the following answer choices: 
- heat produced
 - electron acceptor
 - photosynthesis
 - Chemical energy
 - preventing heat transfer
 - Veins and arteries.
 - it keeps an organism warm
 - It helps them survive

Now knowing that electron transport is the final stage of aerobic respiration and aerobic respiration is an oxidative process which uses oxygen as a final electron acceptor, choose the best answer.


 

  electron acceptor       