What is the theory for formation of fossil fuel plz help A:cabon dioxide levels decreased, resulting in nitrogen fixation

B:earth cooled, changing oxygen to carbon

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

D:fossil fuels arrived on earth from comets and asteroids

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The measure of the angles supplement is 30 more than four times that of its complement. find the measure of the angle described

Land is to arable ; river is a, navigable b, shallow c, presumsor d, water