Fact 1: Acactus stem is used for storing water.

Fact 2: H20 Bottled water was generally consumed last year.

Given the two facts above, answer the question "A cactus stem is used for storing what?" with the following options: 
- roots
 - rain
 - cactus seeds
 - CO2
 - RNA
 - calories
 - H20
 - h2o


 

       H20  