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Up, down and all around is the way in which the circulation of an oak tree (Quercus spp) works.

Specifically, all circulation is associated with the phloem and the xylem. The phloem is the treewide channel by which processed nutrients and photosynthetic products go flowing downward. The xylem is the treewide channel by which dissolved nutrients from the roots go upward, against gravity and because of capillary action.

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14y ago

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