C the region that codes for rna folds
i don't know if this is right i tried
Answer:
C
Explanation:
polymerase Chain Reaction PCR is your answer 100%
Well since cacti are usually found in hot and dry places they wont have much of a supply of water. so the cacti will grow and adapt over time to need less water; therefor, the cactus stem's structure benefits the plant because it has adapted to need less water. get it?