You are presented with the question "How does a cactus survive droughts?" and the following answer choices: 
- It becomes dormant
 - It helps them survive
 - roots and shoots
 - high humidity
 - circulatory systems
 - roots to grow
 - Holding water in the stem
 - dormant state

Now knowing that acactus stem is used for storing water and cactuses store water, serving as their own reservoirs and surviving long droughts, choose the best answer.


 

       Holding water in the stem  