Skin is an accessory organ of respiration in

Which of the following respiratory organs are present in spiders and scorpions?

Match the organism in Column-$I$ with the respiratory surface in Column-$II$.

Column-$I$	Column-$II$
$i$. Planaria	$a$. Book gills
$ii$. Limulus	$b$. External gills
$iii$. Turtles	$c$. Body surface
$iv$. Amphibian tadpoles	$d$. Cloaca

Match the following columns:

Column-$I$ (Plant Part)	Column-$II$ (Gas Exchange Structure)
$P$. Leaves and young stems	$I$. Lenticels
$Q$. Woody stems	$II$. Stomata
$R$. Roots	$III$. Root hairs

$O_{2}$ exchange with $CO_{2}$ by simple diffusion over the entire body surface takes place in:
$I.$ Sponges
$II.$ Coelenterates
$III.$ Flatworms
Select the correct option to complete the given statement.

Which of the following is a respiratory organ of a scorpion?