Fish and larval amphibians live in water. Although their cells produce all three forms - ammonia, urea, and uric acid - the major form of nitrogenous waste that these animals actually excrete in their urine is which, and why

Explanation:

The major form of nitrogenous waste that fish and larval amphibians actually excrete is ammonia because it is easily excreted in water

An ammonotelic organism excretes nitrogenous waste as soluble ammonia

Most of the aquatic animals including protozoans, crustaceans, platyhelminths, cnidarians, poriferans, echinoderms, fishes, larvae / tadpoles of amphibians are ammonotelic

The majority of ammonia produced by typical fish species results from amino acid catabolism via specific deaminases or by transdeamination through the combined actions of aminotransferases and glutamate dehydrogenase (GDH) where transdeamination is generally considered to be the major route of ammonia production