With regard to the nitrogen cycle, even though nitrogen makes up approximately 78% of our atmosphere, it is relatively scarce in the lithosphere, hydrosphere, and in organisms. It is however an essential ingredient in the proteins DNA and RNA vital for the organisms on Earth. According to our textbook, nitrogen gas (N2) is chemically inert and cannot cycle out of the atmosphere and into living organisms without all of the following EXCEPT: (a) Nuclear isotope decay is taking place in close proximity to the cycling (b) There is nitrogen fixing bacteria present (c) Lightning occurs (d) Human intervention

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