(D) Pneumatic bones are hollow, air-filled bones that reduce body weight, which is an essential adaptation for flight in birds.Among the given options

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(D) Pneumatic bones are hollow, air-filled bones that reduce body weight, which is an essential adaptation for flight in birds.Among the given options, the pigeon $(Columba \text{ livia})$ belongs to the class $Aves$.Birds possess pneumatic bones to facilitate flight.Therefore, the correct option is $D$.