Fact 1: Oxygen is essential for cellular respiration for all aerobic organisms.

Fact 2: Aerobic organisms consume VOAs and alcohols.

Given the two facts above, answer the question "What is essential for cellular respiration for organisms consuming VOAs and alcohols?" with the following options: 
- carbon
 - glucose
 - h2o
 - Air
 - oxygen
 - Energy
 - Energy.
 - water


 

     oxygen    