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Sympathetic preganglionic axons
Denitrification
The conversion of nitrate (NO3) to nitrogen gas (N2) by certain bacteria (denitrifying bacteria) in the soil; part of the nitrogen cycle.
Ammonification
The conversion of nitrogen-containing organic compounds to ammonia (NH3) by certain soil bacteria (ammonifying bacteria); part of the nitrogen cycle.
Nitrogen Fixation
The conversion of atmospheric nitrogen (N2) to ammonia (NH3) by certain bacteria; part of the nitrogen cycle.
Ecological Pyramids
Graphical representations showing the relative amounts of energy or matter contained within each trophic level in a given ecosystem.
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