Conserving water can be used for survival in a dry environment.
Many cacti have corrugated stems which can expand quickly if water becomes available.
Expandable stems help many cacti survive in dry environments.
What feature of many cacti help them survive in dry environments?
Options:
(a) exoskeleton
(b) Spines for hunting
(c) Expandable stems
(d) an external framework
(e) cactuses
(f) Cooling pipes
(g) genetic diversity
(h) Loud organ pipes