Identify the correct statement:

Which one feature is common to leech,cockroach and scorpion?

Identify the correct terms for the following analogy-based questions:
$(i)$ In Porifera: Water exits through Osculum :: In Cnidaria: ......
(ii) Ctenophora: Comb plates :: Aschelminthes: ......

Select the correct match for $X$ and $Y$:

Column $X$	Column $Y$
$(1)$ Skin without scales	$(P)$ Catla
$(2)$ Placoid scales	$(Q)$ Hagfish
$(3)$ Cycloid scales	$(R)$ Chameleon
$(4)$ Epidermal scales	$(S)$ Ray-fish

$A$: Annelids,arthropods,and molluscs are protostomial coelomates.
$R$: All three phyla include members with bilateral symmetry and a true coelom.

Read the following statements.
$(a)$ Metagenesis is observed in Helminths.
$(b)$ Echinoderms are triploblastic and coelomate animals.
$(c)$ Round worms have organ-system level of body organization.
$(d)$ Comb plates present in ctenophores help in digestion.
$(e)$ Water vascular system is characteristic of Echinoderms.
Choose the correct answer from the options given below.