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Aquatic plants including algae acquire carbon from dissolved bicarbonates (HCO3-) [1,2].


SHORT ANSWER From the air LONG ANSWER Trees are autotrophs, which means that they create their own compounds from inorganic carbon. So, carbon comes from inorganic carbon. This carbon comes from $CO_2$ (carbon dioxide) that is present in the air. The process by which this carbon is transformed into organic matter is called photosynthesis. More ...

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