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

Fact 2: Aerobic activities are exercises that cause deep breathing and a fast heart rate.

Given the two facts above, answer the question "what can cause blood pH to become unbalanced?" with the following options: 
- aerobic activities
 - h2o
 - the sun
 - Heavy rains
 - plasma
 - Dehydration
 - smoking cigarettes
 - cloudy and rainy weather


 

 aerobic activities        