The leaves use the ample sunlight up there to create sugars through photosynthesis

To get a sense of how substances flow through this network,let’s zoom in on sugars,as they travel from a mature tree to a neighboring seedling.Sugar’s journey starts high above the ground,in the leaves of the tallest trees above the canopy.The leaves use the ample sunlight up there to create sugars through photosynthesis.This essential fuel then travels through the tree to the base of the trunk in the thick sap.