Mammalia: pinnae absent in whales.
Cyclostomata: paired appendages absent in Agnatha.
Aves: Almost all the aves show presence of nonglandular skin.
Select the option from the following having matching characteristics for the mentioned group without any exception:
Held on 30 Apr 2015 · Verified 9 Jul 2026.
| 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 |
| Characteristics | Class |
| Sucking and circular mouth; jaws absent, integument without scales paired appendages | Cyclostomata |
| Characteristics | Class |
| Body covered with feathers; skin moist and glandular, fore - limbs form wings; lungs with air sacs | Aves |
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