When material is burned or metabolized (burned for cellular energy), water is formed as a result. A simple form of natural gas, methane CH4, can be burned with oxygen to form CO2 and H2O: carbon dioxide and water.
Glucose is similarly broken down in our cells, although more slowly. We sweat, pee, and exhale water out all the time. This goes back into the environment and completes the water cycle as rain.
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