Question

What are some examples of the nitrogen cycle?

Answer 1

Rhizobium, bacteria that can transform atmospheric nitrogen through the process of nitrogen fixation.

Explanation:

The movement of nitrogen between the atmosphere, biosphere, and geosphere in different forms is called the nitrogen cycle.
http://www.visionlearning.com/en/library/Earth-Science/6/The-Nitrogen-Cycle/98

The nitrogen cycle. Yellow arrows indicate human sources of nitrogen to the environment. Red arrows indicate processes in which microorganisms participate in the transformation of nitrogen. Blue arrows indicate physical forces acting on nitrogen. And green arrows indicate natural processes affecting the form and fate of nitrogen that do not involve microbes.