Fact 1: Acactus stem is used for storing water.

Fact 2: Moisture is stored in the spongy stem or root systems of the cactus during rainfall.

Given the two facts above, answer the question "What is a cactus stem used to reserve?" with the following options: 
- dishwater
 - ocean water
 - Water
 - hydration
 - moisture
 - cactus fruit
 - nutrients
 - moist towels


 

     moisture    