You are presented with the question "what can cause blood pH to become unbalanced?" and the following answer choices: 
- aerobic activities
 - h2o
 - the sun
 - Heavy rains
 - plasma
 - Dehydration
 - smoking cigarettes
 - cloudy and rainy weather

Now knowing that blood pH may become unbalanced if the rate of breathing is too fast or too slow and aerobic activities are exercises that cause deep breathing and a fast heart rate, choose the best answer.


 

 aerobic activities        