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

Question

Characteristics	Class
Sucking and circular mouth; jaws absent,integument without scals; paired appendages.	Cyclostomata

Characteristics	Class
Body covered with feathers; skin moist and glandular, forelimbs form wings; lungs- with air sacs.	Aves

Characteristics	Class
Mammary gland; hair on body; pinnae; two pairs of limbs.	Mammalia

Characteristics	Class
Mouth ventral; gills without operculum; skin with placoid scales; persistent notochord.	Chondrichthyes

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