You are presented with the question "What may become unbalanced if the lungs are working too fast or too slow?" and the following answer choices: 
- Decibels
 - hair on head
 - air pressure
 - gasoline levels
 - Acids
 - energy usage
 - brain chemistry
 - blood pH

Now knowing that blood pH may become unbalanced if the rate of breathing is too fast or too slow and mammals breathe with lungs, choose the best answer.


 

        blood pH 