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Enviorment. the air, water, minerals, organisms, and all otherexternal factors surrounding and affecting a given organisma any time.

pollution:the introduction of harmful substances or products into theenvironment

Ammonia NH3

Ammonification
When plants and animals die, bacteria convert nitrogen nutrients back into ammonium salts and ammonia. This conversion process is called ammonification.Anaerobic bacteria can convert ammonia into nitrogen gas through the process of denitrification:
NO3- + CH2O + H+ -> ½ N2O + CO2 + 1½ H2O
Denitrification returns nitrogen to the atmosphere,completing the cycle.
http://chemistry.about.com/od/geochemistry/ss/nitrogencycle.htm
http://www.youtube.com/watch?v=sNkdAs1e7Cw&feature=relmfu
Ammonia contributes significantly tothe nutritional needs of terrestrial organisms by serving as a precursor tofood and fertilizers. Ammonia, either directly or indirectly, is also a building-block for the synthesis of many pharmaceuticals and is used inmany commercial cleaning products. Although in wide use, ammonia is both caustic and hazardous. In 2006, worldwide production was estimated at 146.5 million tonnes.[7]
anhydrous ammonia
Ammonia isfound in trace quantities in the atmosphere, being produced from the putrefaction (decay process) of nitrogenous animal and vegetable matter. Ammonia and ammonium salts are also found in smallquantities in rainwater, whereasammonium chloride (sal-ammoniac), and ammonium sulfate are found in volcanic districts; crystals of ammonium bicarbonate have been found in Patagonian guano. The kidneys secreteNH3 to neutralize excess acid.[9] Ammonium salts also are found distributed through all fertile soil and in seawater. Substances containing ammonia, or those that are similar to it, arecalled ammoniacal. Ammonia is found on Pluto, Jupiter and, in small amounts, on Uranus.
http://www.rmtech.net/uses_of_ammonia.htm

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Ammonia's role in...