Scientists are still trying to figure it out. We know that the majority of wood cells are arranged around the outside of the tree, forming a “straw”; water is then directed up the straw-like tree trunk. Currently, the most widely accepted theory about how the water is pulled up the tree is cohesion theory. This theory holds that water is pulled up the tree by the sun evaporating water out of the canopy and changing the tension in the tree.
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