The similarity of bone structure in the forelimbs of many vertebrates is an example of homology, The homologous organs have the same fundamental structure but are adapted to perform different functions, eg. forelimbs of man, cheetah, whale, and bat.
Analogous organs show convergent evolution. These organs have similar functions but are different in their structural details and origin. Development of different functional structures from a common ancestral form is called adaptive radiation.