Fact 1: Conserving water can be used for survival in a dry environment.

Fact 2: Most of the southwest is semi desert and very dry.

Given the two facts above, answer the question "Where is conserving water useful for survival?" with the following options: 
- abalone
 - desert
 - marshland
 - cactuses
 - earth
 - wetlands
 - river bank
 - watershed


 

  desert       