What is common between humans and earthworms?

The characteristic that is shared by urea,uric acid and ammonia is/are:
$I.$ They are nitrogenous wastes.
$II.$ They all need very large amount of water for excretion.
$III.$ They are all equally toxic.
$IV.$ They are equally in the kidneys.

The function of the kidney in mammals is to excrete:

Which of the following groups contains final excretory products?

An advantage of excreting nitrogenous wastes in the form of uric acid is that

Which of the following is a uricotelic animal?