How are homologous bones similar in a Dolphins flipper birds wing and a dogs leg?

Homologous bones in a dolphin's flipper, a bird's wing, and a dog's leg share a common structural framework despite their different functions. These bones, such as the humerus, radius, and ulna, demonstrate a similar arrangement and composition, reflecting their evolutionary origins from a common ancestor. This similarity illustrates how diverse species adapt their skeletal structures to suit various environments and modes of locomotion, while maintaining fundamental anatomical features.