Biology / Bio 3663 · Atom · ~20 seconds
The Nitrogen Cycle
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The nitrogen cycle moves nitrogen between its inert atmospheric form and biologically usable ones, entering through the fixation of Bio 2585 and returning by denitrification.
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Nitrogen-fixing bacteria in legume root nodules convert nitrogen gas into ammonia usable by the plant.
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Most organisms cannot use atmospheric nitrogen directly — fixation is a specialized bacterial bottleneck the cycle depends on.