It’s actually weirder. Plants are mostly made out of air. They take carbon dioxide (CO2) and turn it into oxygen (O2). This why planting trees is a popular activity for offsetting carbon emissions. This process generates leftover carbon, and that carbon is used to build the physical structures of the plant. Those physical structures are still packed full of water, which gives the plants most of their mass, but the reason why you see a leaf or stem and not a puddle is because of carbon plucked from the air.
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