What is the role of sebaceous glands in excretion?

Which of the following organs can be transplanted?

Sea gulls excrete excess of $NaCl$ from:

Prussic acid formed during metabolism is rendered harmless by

What is the function of the secretion of sweat glands?

Components present in sweat $- P$
Components present in sebum $- Q$
$I -$ Sterols,$II -$ Waxes,$III - NaCl$,$IV -$ Hydrocarbons,
$V -$ Lactic acid,$VI -$ Small amounts of urea
Select the correct option for $P$ and $Q$.
$P \quad Q$