The forelimb of vertebrates are pentadactyl i.e. consist of same bones humerous, radius, ulna, carpals, metacarpals and phalangers but differ in their function in different organisms.

The forelimbs of the following animals got modified as shown below : $(i)$ Whale are modified for swimming. $(ii)$ Bat and birds are modified for flying. $(iii)$ Horse are modified for running. $(iv)$ Frog are modified for leaping. $(v)$ Man are modified for grasping.