You are presented with the question "What relies on a relatively narrow range of something you can measure with paper strips?" and the following answer choices: 
- Length
 - voltage
 - all life
 - mammals
 - humans
 - Most plants
 - agriculture
 - animals

Now knowing that all life relies on a relatively narrow range of pH, or acidity and acidity is measured with a pH meter or with pH paper strips, choose the best answer.


 

   all life      