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Biology, 14.10.2019 19:30 Carlosanddana123

Which is a leading theory for the formation of fossil fuels?

a. fossil fuels arrived on earth from comets and asteroids.

b. carbon dioxide levels decreased, resulting in nitrogen fixation.

c. earth cooled, changing oxygen into carbon.

d. fossil fuels are the remnants of organisms that lived a long time
ago and were buried, heated, and formed into hydrocarbons.

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