Fact 1: Electron transport is the final stage of aerobic respiration.

Fact 2: Aerobic respiration requires Oxygen.

Given the two facts above, answer the question "What involves oxygen?" with the following options: 
- an engine
 - Burning fuel and air
 - space
 - carbon
 - Movement of an air mass
 - nitrogen
 - electron transport
 - igniting fuel and oxidiser


 

       electron transport  