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How is CO2 fixed in the atmosphere?

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CO2 is fixed in atmosphere in many ways: 

(a) During the process of respiration in humans and animals, carbon dioxide released into the atmosphere as a by-product 

(b) Decomposition is the largest source through which carbon is returned to the atmosphere as carbon 

(c) Weathering of rocks. 

(d) By burning the fossil fuels 

(e) From Volcanic eruptions

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