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Q.

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

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a

Aves : Fly with the help of wings.

b

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

c

Chondrichthyes : Have an air bladder which regulates buoyancy.

d

Chordata : The notochord of the embryo is replaced by a vertebral column in the adult.

answer is B.

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Detailed Solution

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

Chordata : Notochord is not replaced in all of them

Aves : Flightless birds exist

Chondrichthyes : Air bladder is absent

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