Quote:
Originally Posted by AnimeSpirit
There are traces of ammonia (nitrogen and hydrogen) in the bloodstream, in the liver, the instestines, and in urine as well.
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Right you are Anime. Then we take a piss and it flows into the river where bacteria (nitrosomonas) convert the ammonia to nitrite, and then other bacteria (nitrobacter) convert the nitrite to nitrate. Then plants absorb the nitrate as fertilizer. Thus the circle of life.