Read the following statements and find out the correct statement.
$a$. Urinary bladder is absent in fishes
$b$. Gambusia fish eradicates mosquito larva
$c$. Ampulla of Lorenzini present in dogfish act as thermoreceptors
$d$. Electric organs are modified muscles

In Mollusca, excretion occurs through $......$ and in Hemichordata, it occurs through $......$.

Match the following:

Column-$I$	Column-$II$
$(a)$ Trygon	$(i)$ Echinodermata
$(b)$ Ascidia	(ii) Viviparous
$(c)$ Asterias	(iii) Chondrichthyes
$(d)$ Kangaroo	(iv) Oviparous
$(e)$ Penguin	$(v)$ Urochordata

Select the incorrect statements from the following:
$A$. Digestive system in Platyhelminthes is incomplete.
$B$. Bilateral symmetry is a characteristic feature of adult Echinoderms.
$C$. Pseudocoelom is possessed by Aschelminthes.
$D$. Notochord is persistent throughout life in the class Chondrichthyes.
$E$. Members of class Reptilia maintain a constant body temperature.

Column $-I$ represents the animal class, while Column $-II$ represents the exoskeleton. Choose the correct option:

Column $-I$	Column $-II$
$(A)$ Cartilaginous fishes	$(i)$ Cycloid scales
$(B)$ Bony fishes	$(ii)$ Epidermal scales
$(C)$ Reptiles	$(iii)$ Placoid scales

Which of the following pairs is correctly matched?