Diagram (A) depicts time that evoked to the front limbs of a common ancestor whose bones resembled those of an ancient foh. I these animals had no recent common ancestor, they would be unlikely to share so many common structures. Similarly, a bid wing and a horse front limb have similar structures and development, but different functions
Diagram (1) depicts the wings of a butterfly and the wings of a bat. Although they have similar functions, they don't have similar bone structure