The pipes within a trees internal system is referred to as the “xylem vessels” and they run through a layer referred to as the “cambium” which carries water upwards from the roots to the canopy. When an oak tree is attacked, it produces poisons which will stop the insects which are harming it. The main defense chemicals oak trees use are phenolycs and tannins, which are incidentally found in tea and are what give tea its taste. Tea has a lot of tannin and tannin is the chemical which produces th...
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