Question

why formation of urea is advantageous for terrestrial animals?

Answer 1

Urea has properties which make it useful in its own right. For example, because of its high nitrogen content, urea is often used as a component of agricultural fertilizers. Also, urea has the ability to weakly bond to many large organic compounds, surrounding them in an inert 'shell' and so inhibiting intermolecular hydrogen bonding. This behaviour prevents the large molecules sticking together, and so can be used to separate mixtures, in, for example, the production of aviation fuel and lubricating oils.

Answer 2

Mammals, including humans, are the primary producers of urea. Because they secrete urea as the primary nitrogenous waste product, they are called ureotelic animals. Urea serves an important role in the metabolism of nitrogen-containing compounds by animals. It is the main nitrogen-containing substance in the urine of mammals. Urea is a colorless, odorless solid, highly soluble in water, and practically non-toxic. Dissolved in water, it is neither acidic nor alkaline. The body uses it in many processes, the most notable one being nitrogen excretion. Urea is widely used in fertilizers as a convenient source of nitrogen. It is also an important raw material for the chemical industry.
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