You are presented with the question "When the rain stops the stem used for storing water is fat because the what drink the water" and the following answer choices: 
- animals
 - liquid
 - lipids
 - skin
 - fatty
 - fibrous
 - leaves
 - roots

Now knowing that acactus stem is used for storing water and when the rain stops the cactus is fat because the cactus roots drink the water, choose the best answer.


 

        roots 