You are presented with the question "What involves oxygen?" and the following answer choices: 
- an engine
 - Burning fuel and air
 - space
 - carbon
 - Movement of an air mass
 - nitrogen
 - electron transport
 - igniting fuel and oxidiser

Now knowing that electron transport is the final stage of aerobic respiration and aerobic respiration requires Oxygen, choose the best answer.


 

       electron transport  