A cactus stem is used for storing water.
Some plants, like cactus, have a water storage system.
Some plants have a water storage system in their stem.
Where do some plants store their water?
Options:
a. loose soil
b. In their stem
c. peachleaf willow
d. barrel-shaped
e. watershed
f. near the shoreline
g. dormant state
h. by indirect light