Fact 1: Acactus stem is used for storing water.

Fact 2: Saguaro cactus grow very slowly.

Given the two facts above, answer the question "What is stored in the stem of the saguaro?" with the following options: 
- gas
 - water
 - ice
 - sand
 - fibrous
 - sugar
 - glucose
 - energy


 

  water       