And some of this electromagnetic radiation eventually makes its way to the Earth and to the plants on Earth. And so what these plants do is they take the carbon dioxide in the atmosphere, that's the carbon source. And then they take the water found in the soil and they use the energy stored in light. They combine these two reactants to produce these products. So the sugar molecule, as well as oxygen that we then breathe and use on the electron transport chain in the process of aerobic cellular respiration. So essentially, when we ingest these carbohydrates, which are produced by plants, for instance, when we ingest bread products or pasta products and so forth, we essentially ingest carbohydrates which are derived and produced by plants.