Which trait is common among Earthworm, Leech, and Centipede?

$S$ Statement: Aquatic life,gills,fins,and scales are characteristics of the fish group.
$R$ Reason: External ear (pinna) and hair on the body are characteristics of the mammalian group.
$(a)$ Both $S$ and $R$ are true,$R$ is the correct explanation of $S$.
$(b)$ Both $S$ and $R$ are true,but $R$ is not the correct explanation of $S$.
$(c)$ $S$ is true and $R$ is false.
$(d)$ $S$ is false and $R$ is true.
$(e)$ Both $S$ and $R$ are false.

Which of the following animals is $NOT$ included in the phylum $Platyhelminthes$?

Column $-I$ represents the phylum and Column $-II$ represents the larval stage. Select the correct option:

Column $-I$	Column $-II$
$(A)$ Porifera	$(i)$ Tornaria larva
$(B)$ Hemichordata	$(ii)$ Free-swimming larva
$(C)$ Cnidaria	$(iii)$ Parenchymula larva
$(D)$ Echinodermata	$(iv)$ Planula larva

Select the correct option for the following statements:
$(i)$ Platyhelminthes are pseudocoelomate / acoelomate.
$(ii)$ Cnidarians are radially symmetrical / asymmetrical.

Select the correct option in respect of characteristics of each group:-

Characteristic	Cyclostomata	Chondrichthyes	Osteichthyes
$(i)$ Habitat	Marine	Marine	Marine,Fresh Water
(ii) Mouth	Sucking mouth	Ventral mouth	Terminal mouth
(iii) Gill Slits	$6-15$ Pairs	$5-7$ Pairs	$4$ Pairs
(iv) Scales	Absent	Placoid	Cycloid/Ctenoid
$(v)$ Fins	Unpaired	Paired	Paired