A cactus stem is used for storing water.
Drink lots of water for hydration.
A cactus stem can be used for hydration.
What can be used for hydration?
Options:
(1) tree bark
(2) leaf
(3) fur and fat
(4) Heat energy
(5) Calcium carbonate
(6) tree branch
(7) mussels
(8) a cactus stem