The calcareous ossicles in echinoderms form the

Tube feet are the characteristic structures of

An enterocoelomate invertebrate group is

Match List-$I$ with List-$II$:

List-$I$ (Biological Name)	List-$II$ (Common Name)
$A$. Asterias	$I$. Sea urchin
$B$. Antedon	$II$. Brittle star
$C$. Echinus	$III$. Sea lily
$D$. Ophiura	$IV$. Star fish

Choose the correct answer from the options given below:

$A$ special feature of Evisceration (Autotomy) is found in

Animals that exhibit bilateral symmetry in the larval stage and radial (pentamerous) symmetry in the adult stage belong to the phylum: