Which of the following is not a parasitic adaptation?

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

Match the following list of animals with their level of organisation and choose the correct sequence.

Column $I$	Column $II$
$A$. Organ level	$p$. Pheretima
$B$. Cellular aggregate level	$q$. Fasciola
$C$. Tissue level	$r$. Spongilla
$D$. Organ system level	$s$. Obelia

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
$A - B - C - D - E - F$

Identify the correct terms for the following analogy-based questions:
$(i)$ Porifera : Asymmetrical :: Cnidaria : .........
$(ii)$ Annelida : Coelomate :: Platyhelminthes : ......

In which one of the following is the genus name,its two characters,and phylum $NOT$ correctly matched?