Which of the following possess larval stages?

Fill in the blanks marked in the classification table of $Vertebrata$ from the choices provided below with respect to $A, B, C, D, E$ and $F$ and choose the correct option:
$I$. Pisces
$II$. Osteichthyes
$III$. Agnatha
$IV$. Gnathostomata
$V$. Chondrichthyes
$VI$. Cyclostomata
$A - B - C - D - E - F$

Choose the correct option from the following statements:
$(i)$ $Pleurobrachia$ and $Ctenoplana$ are examples of the phylum $Ctenophora$.
$(ii)$ $Spongilla$ is a freshwater sponge.

Which feature is common among leech,cockroach,and scorpion?

Match the following columns:

Column-$I$	Column-$II$
$(a)$ Barbus	$(i)$ Epidermal scales
$(b)$ Crocodile	$(ii)$ Absence of head
$(c)$ Amphioxus	$(iii)$ Cycloid scales
$(d)$ Lamprey	$(iv)$ Scaleless skin

The study of lizards is known as: