What is the Main Form of Nitrogenous Waste Released by Mammals

Question

What is the main form of nitrogenous waste released by mammals to their environment?
A) amino acids
B) urea
C) ammonia
D) nitrate

Accepted Answer

Mammals primarily excrete urea as their form of nitrogenous waste. Urea is less toxic than ammonia and can be concentrated to conserve water, making it suitable for terrestrial animals.