The characteristic odor of urine is due to the presence of . . . . . . .

The chief nitrogenous waste in the urine of rabbits or terrestrial mammals is:

Uric acid is formed in humans from:

What are inulin and raphides in plants?

The characteristic that is shared by urea,uric acid and ammonia is/are:
$(A)$ They are nitrogenous wastes.
$(B)$ They all need very large amount of water for excretion.
$(C)$ They all are equally toxic.
$(D)$ They are produced in the kidneys.

Excretory waste of birds and reptiles are