Explain "in vivo" and "in vitro" nitrogen fixation.
Nitrogen fixation refers to the conversion of atmospheric nitrogen (N₂) into ammonia (NH₃) or related bioavailable nitrogen compounds that can be utilized by living organisms. This process occurs naturally through biological systems or can be simulated under controlled conditions, classified broadly as "in vivo" and "in vitro" nitrogen fixation. In vivo nitrogen fixation occurs within living organisms, primarily in symbiotic associations between certain bacteria and plants. The most studied example is the ___ ____ ________ ____ ____ ___ __________ ________.
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