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photosynthesis. this sugar powers the tree's cellular respiration, promotes its growth, and stores as starch in its roots. in spring, the alternating night-time frost and daytime thaw promotes the flow of sap through the maple tree. during the cold night, its branches freeze, causing the gas in its fibres
to contract. the sap also freezes but, unlike the gas, it expands in the tree's fibres. all night long, the water absorbed by the roots rises up through the tree, soaking up the sugar reserves as it goes. when daytime comes, the air warms and thaws the tree's branches. the heat liquifies the sap, and...
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