The study of snakes is called:

Match List $I$ with List $II$ :

List $I$	List $II$
$A$. Pleurobrachia	$I$. Mollusca
$B$. Radula	$II$. Ctenophora
$C$. Stomochord	$III$. Osteichthyes
$D$. Air bladder	$IV$. Hemichordata

Choose the correct answer from the options given below :

Match the following columns.

$a$. Cellular level of organisation	$1$. Cnidarians
$b$. Organ level of organisation	$2$. Platyhelminthes
$c$. Organ system level of organisation	$3$. Chordates
$d$. Tissue level of organisation	$4$. Porifera

Select the correct sequence for $a, b, c, d$.

Which one of the following animals is correctly matched with its one characteristic and the taxon?

Choose the correct option for the following statements:
$(i)$ Metamerism is a characteristic feature of $Annelida$ / $Arthropoda$.
$(ii)$ Internal buds in sponges are called $Gemmules$ / $Gemmi$.

Given are the four matches of phyla with their characteristic cells:
$A$. Coelenterata - Nematocytes
$B$. Porifera - Choanocytes
$C$. Ctenophora - Solenocytes
$D$. Platyhelminthes - Nephrocytes
Mark the option that has both correct matches.