A. is found only in the bristlecone pine
B. helps stop rot from starting
C. assists the tree trunks to develop
D. flows from the branches to the tree trunk
B
Dẫn chứng: An additional factor that contributes to the long life of the bristlecone pine is that this type of tree has a high percentage of resin, which prevents rot from developing in the tree trunk and branches.
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