Acactus stem is used for storing water, and other animals eat cactus to get water. Given these facts, why do animals eat stems among the following options:
- Animal survival
 - A transportation fuel
 - it keeps an organism warm
 - It gets more light
 - basic building blocks of life
 - Plants store liquids there
 - it needs them
 - Help plants grow


 

      Plants store liquids there   