Find the mismatched pair regarding the exoskeleton.

The study of lizards is known as:

$A$ fish is characterised by the presence of

Which of the following characteristics are $NOT$ common to both Aves (birds) and Mammalia (mammals)?
$I$ - Homeothermic (warm-blooded) animals.
$II$ - Respire through lungs.
$III$ - Possess a four-chambered heart.
$IV$ - Dioecious (sexes are separate).
$V$ - Possess hair on the skin.
$VI$ - Show internal fertilization.
$VII$ - Possess teeth.

Flatworms and roundworms are respectively called ........

Select the correct option matching the columns $A, B$, and $C$:

$A$	$B$	$C$
$(1)$ Tube feet	$(a)$ Helps in digestion	$(e)$ Mollusca
$(2)$ Radula	$(b)$ Helps in balance	$(f)$ Echinodermata
$(3)$ Statocyst	$(c)$ Helps in locomotion	$(g)$ Annelida
$(4)$ Setae	$(d)$ Water vascular system	$(h)$ Arthropoda