Fact 1: All life relies on a relatively narrow range of pH, or acidity.

Fact 2: Acids and bases are a part of everyday life.

Given the two facts above, answer the question "what substances are relied on for life?" with the following options: 
- magma
 - plants
 - poison
 - food
 - oxygen
 - fat
 - bases
 - battery acid


 

       bases  