Which one of the following body functions is not performed by kidneys?

Which one of the following options gives the correct categorization of six animals according to the type of nitrogenous waste they excrete?

Option	Ammonotelic	Ureotelic	Uricotelic
$a$	Pigeon,human	Aquatic amphibia,lizards	Cockroach,frog
$b$	Frog,lizards	Aquatic amphibia,humans	Cockroach,pigeon
$c$	Aquatic amphibia	Frog,human	Pigeon,lizards,cockroach
$d$	Aquatic amphibia	Cockroach,humans	Frog,pigeon,lizards

$A$: Birds have metanephric kidneys and no urinary bladder.
$R$: South American Ostrich has a urinary bladder.

Stale urine smells like ammonia because

Which of the following statements is/are true?
$I.$ Urine is hypertonic while entering distal convoluted tubule.
$II.$ When the urine moves in the collecting tubule,it becomes hypertonic.
$III.$ Urine is isotonic in proximal convoluted tubule.
$IV.$ Urine becomes more and more hypotonic as it passes through the descending Henle's loop.

Explain briefly,micturition and disorders of the excretory system.