During photosynthesis, trees (and other plants, as well as algae and cyanobacteria) absorb light to power to following chemical reaction. Six molecules each of carbon dioxide and water are converted to sugar and six molecules of oxygen. There may be some variation in the amounts of CO2, water, and O2, if the end molecule is something other than sugar – plants convert the sugars produced by photosynthesis to fats, proteins, nucleic acids, and all other needed organic molecules. Sugar and such other chemical compounds is what the plant needs, while the oxygen is released into the atmosphere as the only by-product.
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