(B) The class $Aves$ is characterized by the presence of feathers,which are unique to them.They possess a four-chambered heart.Their bones are pneumat

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(B) The class $Aves$ is characterized by the presence of feathers,which are unique to them.They possess a four-chambered heart.Their bones are pneumatic (hollow with air cavities) to reduce body weight for flight.These features are diagnostic traits of birds,which belong to the class $Aves$.