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

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

Correct answer: Mouth ventral, gills without operculum; skin with placoid scales; persistent notochord - Chondrichthyes

Solution

Chondrichthyes are cartilaginous fishes with a ventral mouth, gills not covered by an operculum, placoid scales, and a persistent notochord. The other options mix traits from different classes, so they are not fully correct combinations.

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