Fact 1: Blood pH may become unbalanced if the rate of breathing is too fast or too slow.

Fact 2: Mammals breathe with lungs.

Given the two facts above, answer the question "What may become unbalanced if the lungs are working too fast or too slow?" with the following options: 
- Decibels
 - hair on head
 - air pressure
 - gasoline levels
 - Acids
 - energy usage
 - brain chemistry
 - blood pH


 

        blood pH 