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Which one of the following groups of animals is correctly matched with its characteristic feature without any exception?

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Chordata: Notochord of the embryo is replaced by a vertebral column in the adult

Mammalia: Possess mammary glands by which the young ones are nourished

Chondrichthyes: Have an air bladder which regulates buoyancy

Aves: Fly with the help of wings and feathers

answer is B.

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Detailed Solution

All mammals posses mammary glands by which the young ones are nourished.

Notochord is not replaced by a vertebral column in protochordates (Urochordata and Cephalochordata).

An air bladder is absent in cartilaginous fishes (Chondrichthyes).

Some birds like ostrich are flightless.

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