You are presented with the question "Something critical for regulating oxygen from hemoglobin may become unbalanced if breathing is what?" and the following answer choices: 
- major threat to health
 - colder and wetter
 - too fast or too slow
 - too hot and heavy
 - a lot of human deaths
 - too loud and soft
 - deadly and devastating
 - too warm and cold

Now knowing that blood pH may become unbalanced if the rate of breathing is too fast or too slow and for example, blood pH is critical for regulating the binding and release of oxygen from hemoglobin, choose the best answer.


 

   too fast or too slow      