Fill in the blanks

Forelimb of whale is for swimming where as in horse it is used for_____________.

Forelimb of the whale is for swimming whereas in horse it is used for running.

Explanation: The organs which have the same basic structure but different functions are called homologous organs. The homologous organs of different animals provide evidence for evolution. The that internal structure of forelimb of a whale (swimmer), a wing of a bird (flyer) the foreleg of a horse (runner), claw of mole (digger) and hand of a man (grasping) has the same origin.