If something critical for regulating oxygen from hemoglobin may become unbalanced if the rate of breathing is too fast or too slow, then something critical for regulating oxygen from hemoglobin may become unbalanced if breathing is what?

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

 

   too fast or too slow       