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Researchers have found that increasing global temperatures will cause methane (CH4), a greenhouse gas, to be emitted at increasing rates by microorganisms found in freshwater ecosystems. What biogeochemical cycle will be most directly affected by this increase in methane? Carbon cycle Hydrogeological cycle Nitrogen cycle Phosphorous cycle

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Yna9141
In this item we are given that the methane emission rate will go high due to the foreseen temperature rise cause by global warming. The biogeochemical cycle that will be affected directly through this is the Carbon cycle.  

Methane is a compound comprised of one atom of carbon and four atoms of hydrogen. Carbon cycle involves the process in which the carbon dioxide emitted by the organisms will be absorbed by the producers. The carbon which are to be absorbed by producers should come in the form of carbon dioxide.