Almost all aquatic animals excrete ammonia as the nitrogenous waste product. Which of the following statements is not in agreement with this situation?

The correct option is D. All statements are true for the situation.

Ammonia is the end product of protein metabolism in aquatic animals. Ammonia is highly toxic and is readily removed in aquatic animals mainly through the gills and the rest through urine and feces. Gills is the region of gaseous exchange where the carbon dioxide diffuses out of the blood during respiration. Ammonia is released as an excretory product from the gills in a gaseous form, which readily dissolves in water as ammonia gas has a higher water solubility.