Which of the following substances is involved in the healing process?

Identify the correct terms for the following analogy-based questions:
$(i)$ In cockroach,blood is : $Hemolymph$ :: In frog : ..........
$(ii)$ Before nymphal stage : $Wing$ $pad$ :: In adult cockroach : ...
$(iii)$ In earthworm : Tactile receptors :: In cockroach,dorsal side of the head : .....

$Pheretima$ $posthuma$ and $Periplaneta$ are similar in which aspect?

In mammals,Haversian canals are connected with each other by transverse canals,which are called:

Melanin provides protection against......

Match the following (w.r.t. type of metamorphosis involved):

Column-$I$	Column-$II$
$(a)$. Paurometabolous	$(i)$. Silk worm
$(b)$. Hemimetabolous	$(ii)$. Grasshopper
$(c)$. Holometabolous	$(iii)$. Silver fish
$(d)$. Ametabolous	$(iv)$. Dragon fly