Question

Compare the nitrogen, carbon, and oxygen cycles

Answer 1

The main difference is the way how the three of those cycles are performed. For example, as nitrogen is abundant then it cannot be used by plants or animals in its gas form. The Carbon cycle does not need an especial process like the one of the Nitrogen. Plants can take carbon dioxide and is used for the photosyntesis process. All three cycles are found in soil. Oxygen cycles recycles the oxigen. 

Answer 2

These 3 cycles have a  part of their cycle where they exist in gaseous form. The three cycles are also critical to the living organisms on earth.

The differences are that nitrogen cannot be used in its gaseous form by living organism and has to be fixed in the soil to nitrites through the process of nitrification.