Identify the mismatched pair from the following:

Match the following columns:

Column-$I$	Column-$II$
$I.$ Skin without scales	$p.$ $Catla$
$II.$ Placoid scales	$q.$ $Hagfish$
$III.$ Cycloid scales	$r.$ $Chameleon$
$IV.$ Epidermal scales	$s.$ $Ray-fish$

Identify the location and function of the following structures:
$(i)$ Water vascular system
$(ii)$ Cloaca

Column $-I$ contains the organs of locomotion and Column $-II$ contains the phyla in which they are found. Select the correct combination of the two columns:

Column $-I$	Column $-II$
$(A)$ Pseudopodia	$(i)$ Mollusca
$(B)$ Parapodia	$(ii)$ Chondrichthyes
$(C)$ Muscular foot	$(iii)$ Protozoa
$(D)$ Fins	$(iv)$ Annelida

Animals exhibiting radial symmetry are found in:

Trochophore larva is found in