Answer: bat's wing, cat's leg, dolphin flipper, and human arm.
Explanation: homologous means body parts that have similar features and they share common ancestor.
e.g- human beings have bones i.e, Humerus, phalanges, metacarpals, carpals, ulna and radius. These features are also seen in other animals i.e, bat, whales, dolphin, human arm and forearm
human beings, dogs, cats all have similar skeleton which acts as homologous structure to a remaining pair of bones in snakes.