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

Characteristic Class
Mammary gland; hair on body; pinnae; two pairs of Limbs Mammalia

Characteristic Class
Mouth ventral, gills without operculum; skin with placoid scales; persistent notochord Chondricht hyes

Characteristic Class
Sucking and circular mouth; jaws absent, integument without scales; paired appendages Cyclostomata

Characteristic Class
Body covered with feathers; skin moist and glandular; fore-limbs form wings; lungs with air sacs
Aves

Solution

Characteristic	Class
Sucking and circular mouth; jaws absent, integument without scales; paired appendages	Cyclostomata

Cyclostomata bears sucking and circular mouth with no jaws integument without scales and gills (5-16) are present as paired appendages in lateral sac-like pouches of pharynx.
Persistent notochord is a feature of Cyclostomata not Chondrichthyes. Mammals lack pinnae and in over the skin is dry and skin glands are absent except the oil glands.