Nitrogen fixation nitrogen fixation any natural or industrial process that causes free nitrogen n2 which is a relatively inert gas plentiful in air to combine chemically with other elements to form more reactive nitrogen compounds such as ammonia nitrates or nitrites under ordinary conditions nitrogen does. Woa world population awareness is a non profit web publication seeking to inform people about overpopulation unsustainability and overconsumption the impacts including depletion of natural resources water oil soil fertilizers species loss malnutrition poverty displacement of people conflict and what can be done about it womens advancement education reproductive health care . Following administration they are only partially metabolized and therefore a large amount is excreted unaltered or as active metabolites via urine and faeces consequently human antibiotics reach wastewater treatment plants wwtps conventional wwtps are not specifically designed for antibiotic removal and consequently these molecules are released directly into the receiving environment
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