Breathing and Exchange of GasesHard

Question

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

Options

A.Mouth ventral, gills without operculum; skin with placoid scales; persistent notochord , Chondrichthyes
B.Sucking and circular mouth; jaws absent, integument without scales; paired appendages, Cyclostomata
C.Body covered with feathers; skin moist and glandular; fore-limbs form wings; lungs with air sacs,
D.Mammary gland; hair on body; pinnae; two pairs of Limbs, Mammalia

Solution

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