Compost are coming from organic decomposing process. These organic are coming from living things, or at least used to be. It comes from dead animal and plants. The body of an adult human, if exposed to the elements, is reduced to a mere skeleton in about three weeks. The bones last longer, but not a great deal.
Humus is a mixture of the highly altered remains of the original organic matter whether from plants or animals that arrives at the soil surface, as well as new compounds made by bacteria and fungi. But only a small fraction of the original material is destined to become humus. Most simply disappears, turned back into the carbon dioxide (CO2), water, and mineral salts from which it was first made.
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