What is the primary function of the hormone Erythropoietin?

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 $Q$.
$P \quad Q$

The sweat glands are scanty in

What is the function of the secretion of sweat glands?

What is the role of sebaceous glands in excretion?

Other than the kidney,which of the following organs help in the elimination of excretory wastes?
$I.$ Lungs $II.$ Liver $III.$ Skin $IV.$ Spleen
Choose the correct option containing all correct organs.