Ammonia is an inorganic compound occurring ______

• A. Predominantly from wastewater discharges
• B. Predominantly from domestic or wild animals
• C. Naturally or from domestic and wild animals
• D. Naturally or from wastewater discharge, domestic animals, and wild animals

Answer: (C)

Ammonia is inorganic and occurs widely in the environment through natural processes such as the decomposition of organic matter and microbial nitrogen cycling, so it is found naturally in soils and waters. It is also released from animal waste, including both domestic and wild animals, which adds to its presence in the environment. Because of these natural sources plus animal-derived inputs, the statement that best describes where ammonia occurs is that it is natural or comes from domestic and wild animals. While ammonia can be found in wastewater, that source is not the sole or primary origin in most environmental contexts, and including wastewater would overstate its role compared to the natural and animal-related sources.