Q:Fact 1: Acactus stem is used for storing water. Fact 2: Some plants, like cactus, have a water storage system. Given the two facts above, answer the question "Where do some plants store their water?" with the following options: - loose soil - In their stem - peachleaf willow - barrel-shaped - watershed - near the shoreline - dormant state - by indirect light
A:
In their stem