The carbon cycle:
The carbon cycle is the process in which carbon travels from the atmosphere into organisms and the Earth and then back into the atmosphere. Plants take carbon dioxide from the air and use it to make food. Animals then eat the food and carbon is stored in their bodies or released as CO2 through respiration.
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Heroin, Oxycodone, Oxymorphone, Hydromorphone.
These are some.
That would be coal because you can cook with coal, build things out of coal, and use it for energy
