I get your point, but if you were talking to an alien crystalline entity who was completely unfamiliar with all this carbon business, try explaining how we use the sun rays to grow small green plants that figured out how to transform light and air into sugars, and then we have large dumb fairly distant relstives of ours to eat this grass, as they have cleverer stomachs better suited for using tiny microbes to digest the plants, and we then set the large dumb relatives on fire and then eat them. It all sounds very improbable.
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