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

Fact 2: Fungi are aerobic organisms.

Given the two facts above, answer the question "What helps a fungi's cellular respiration?" with the following options: 
- Energy.
 - Energy
 - Oxygen
 - electron
 - Cells
 - lmestone
 - Wood
 - Lungs


 

   Oxygen      