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During the summer the birch tree combines water and carbon dioxide into sugars with the aid of its leaves and of the sunlight. In the autumn, the tree stores extra reserve nutrition for the waking up of the following spring. In the spring the tree sucks up water and nutrients from the soil with its roots. At the same time, it transforms the stored nutrition back to sugars. When dissolved materials, such as sugars, fruit acids and minerals, cumulate in the sap, the sap starts to flow from the roots towards the top of the tree.
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