(D) $Protopterus$ is a member of the class $Dipnoi$,which are commonly known as lung-fishes.These fishes possess both gills for aquatic respiration an

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(D) $Protopterus$ is a member of the class $Dipnoi$,which are commonly known as lung-fishes.These fishes possess both gills for aquatic respiration and lungs for aerial respiration,allowing them to survive in oxygen-poor water or during periods of drought.