Carbon – containing energy sources formed from the decomposing a prehistoric organism or called 

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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answer; i believe that the correct answer is ; males are hemizygous for the x chromosome;