$Monocystis$ belongs to the order:

Cold-blooded animals are those having

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

Which of the following represents the correct combination without any exception?

$Option$	$Characteristics$
$(a)$	$Cyclostomata$: Sucking and circular mouth; jaws absent, integument without scales; paired appendages.
$(b)$	$Aves$: Body covered with feathers; skin moist and glandular, fore-limbs form wings; lungs with air sacs.
$(c)$	$Mammalia$: Mammary gland; hair on body; pinnae; two pairs of limbs.
$(d)$	$Chondrichthyes$: Mouth ventral; gills without operculum; skin with placoid scales; persistent notochord.

Closed circulatory system is present in

Which pair represents a group of hermaphrodite animals?