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

Fact 2: Acidity is measured with a pH meter or with pH paper strips.

Given the two facts above, answer the question "What may become unbalanced if the rate of breathing is too fast or too slow?" with the following options: 
- meiosis
 - rain levels
 - photosynthesis
 - blood acidity
 - an organism's body
 - Veins and arteries.
 - kinetic energy
 - swamp vegetation


 

    blood acidity     