Fact 1: Acactus stem is used for storing water.

Fact 2: Cactuses store water, serving as their own reservoirs and surviving long droughts.

Given the two facts above, answer the question "How does a cactus survive droughts?" with the following options: 
- It becomes dormant
 - It helps them survive
 - roots and shoots
 - high humidity
 - circulatory systems
 - roots to grow
 - Holding water in the stem
 - dormant state


 

       Holding water in the stem  