Question

The first formed nitrogenous waste of vertebrates is

• A. $N{H}_2$
• B. Urea
• C. $N{H}_3$
• D. $N{H}_4$

Answer 1

The correct option is C $N{H}_3$

For terrestrial vertebrates, nitrogenous wastes are removed from body fluids by the action of the kidneys, the same organ involved in maintaining water balance. Ammonia the direct waste produced as a byproduct of protein metabolism.Produced by all animals.Because of its toxicity, many animals convert ammonia into a less toxic form.Any conversion of ammonia into other forms comes at a price, for animals must expend cellular energy (ATP) to convert ammonia to either form of nitrogenous waste listed below.

So, the correct option is 'Ammonia'.