Vertebrae/Backbones I think.
In science a theory is an explanation for a phenomena that has been tested by many scientists, in daily life its another way to say an idea
Answer:
Fossil fuels
explanation: Coal is one type of fossil fuel. This is a nonrenewable energy source whose extraction often damages the environment. Fossil fuels are made from decomposing plants and animals. These fuels are found in the Earth's crust and contain carbon and hydrogen, which can be burned for energy
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