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

	Characteristic	Class
1.	Mammary gland; hair on body; pinnae; two pairs of limbs	Mammalia
2.	Mouth ventral; gills without operculum; skin with placoid scales; persistent notochord	Chondrichthyes
3.	Sucking and circular mouth; jaws absent; integument without scales; paired appendages	Cyclostomata
4.	Body covered with feathers; skin moist and glandular; lungs with air sacs; fore limbs from wings	Aves

Subtopic: Comparative study of Cartilagenous & Bony Fishes | Class Osteichthyes |

Level 3: 35%-60%

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