Which of the following represents the correct
combination without any exception?
| Characteristics | Class | |
| (1) | Mouth ventral, gills without operculum; skin with placoid scales; persistent notochord |
Chondrichthyes |
| (2) | Sucking and circular mouth; jaws absent, integument without scales; paired appendages |
Cyclostomata |
| (3) | Body covered with feathers; skin moist and glandular; fore-limbs form wings; lungs with air sacs |
Aves |
| (4) | Mammary gland; hair on body; pinnae; two pairs of Limbs |
Mammalia |
