Final answer:
Fossil fuels are ancient sources of energy extracted from organic matter and utilized for energy production today.
Explanation:
Fossil fuels are extractable sources of stored energy that were created by ancient ecosystems, such as coal, oil, petroleum, and natural gas. These resources were formed through the anaerobic decay of dead plants and animals, converting ancient solar energy into fossil fuels. Fossil fuels are used to produce energy for various purposes in modern society.
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