nitrifying bacteria
Yes.
well you could add bleach, but that would just release the ammonia as a gas
nitrifying bacteria turns ammonia in decaying matter into nitrates as well as decomposer bacteria decomposed proteins and urea and turns them into ammonia
liver usually converts ammonia to urea
the ammonia is converted by bacteria into ammonium to be used again by plants and bacteria.
Yes there is ammonia in human body. Most of the ammonia in body is obtained during digestion in the intestine. The bacteria break down proteins in food to form ammonia. Liver converts ammonia into urea which you urinate out.
Ammonium ions
When it comes to fishkeeping, Urea is near enough to Ammonia to be treated the same way. They both are deadly poisons to the fish and have to be made safe naturaly by the use of Bacteria in a filter.
Proteins contain the majority of nitrogen in the body which is what will ultimately form urea.
The production of ammonia by bacteria during the decay of nitrogen-containing urea is called nitrogen cycle. The process of combining nitrogen gas with hydrogen to form ammonia is called nitrogen fixation.
Our liver converts ammonia into urea. This urea is excreted out in the urine.
Urea is less toxic than ammonia.