You are presented with the question "Where do some plants store their water?" and the following answer choices: 
- loose soil
 - In their stem
 - peachleaf willow
 - barrel-shaped
 - watershed
 - near the shoreline
 - dormant state
 - by indirect light

Now knowing that acactus stem is used for storing water and some plants, like cactus, have a water storage system, choose the best answer.


 

  In their stem       