 
       
      
    Which of the following represents the correct combination without any exception?
| Characteristics | Class | 
|---|
| Sucking and circular mouth; jaws absent, integument without scales; paired appendages | Cyclostomata | 
| Body covered with feathers; skin moist and glandular; fore-limbs form wings; lungs with air sacs | Aves | 
| Mammary gland; hair on body; pinnae; two pairs or limbs | Mammalia | 
| Mouth ventral; gills without operculum; skin with placoid scales; persistent notochord | Chondrichthyes | 
 
                
                  
Classification of Vertebrata -
It has two divisions and further classes.
1. Division Agantha (jawless)
Class Cyclostomata
2. Division Gnathostomata →
1. Superclass Pisces (bear fins)
1. Class Chondrichthyes
2. Class Osteichthyes
2. Superclass Tetrapoda (bear limbs)
1. Class Amphibia
2. Class Reptilia
3. Class Aves
4. Class Mammals
-
Option 1)
| Sucking and circular mouth; jaws absent, integument without scales; paired appendages | Cyclostomata | 
Incorrect
Option 2)
| Body covered with feathers; skin moist and glandular; fore-limbs form wings; lungs with air sacs | Aves | 
Incorrect
Option 3)
| Mammary gland; hair on body; pinnae; two pairs or limbs | Mammalia | 
Incorrect
Option 4)
| Mouth ventral; gills without operculum; skin with placoid scales; persistent notochord | Chondrichthyes | 
Correct
 
                