How does a yard replenish mass when grass is constantly being cut and discarded?
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Most of the mass of a plant does not come from the soil. If you look at the composition of a plant, it is mostly cellulose and water. The water comes from well, rainwater. The cellulose is made from sugars which are produced by photosynthesis. In this process water and carbon dioxide are combined to produce sugar and oxygen, using energy from sunlight.
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