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What types of ancient organism formed oil and natural gas?

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A fossil fuel is a nonrenewableenergy resource that forms Petroleum, coal, and natural gas are examples of fossil fuels.
User Maurits Evers
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There were many species that contributed to fossil fuels today, including dinosaurs, whales, prehistoric mammals, etc. They 'fossilized' and that's why these fuels (i.e. Oil and Natural Gas) are called Fossil Fuels.
User IronRoei
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