Fact 1: Brain cells die quickly if their oxygen supply is cut off.

Fact 2: Neurons are the nerve cells within the brain.

Given the two facts above, answer the question "What die quickly if their oxygen supply is cut off?" with the following options: 
- neurons
 - insects
 - viruses
 - parasites
 - rocks
 - humans
 - dirt
 - mammals


 

 neurons        