Options are: 1). aerobic activities; 2). h2o; 3). the sun; 4). Heavy rains; 5). plasma; 6). Dehydration; 7). smoking cigarettes; 8). cloudy and rainy weather;

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, what can cause blood pH to become unbalanced?
Answer:
1).