question_answer 15)

  The bones of forelimbs of whale, bat, cheetah and man are similar in structure, because (a) one organism has given rise to another           (b) they share a common ancestor (c) they perform the same function                        (d) the have biochemical similarities

Answer:

   (b)The bones of forelimbs of whale, bat, cheetah and man are similar in structure, because they have a common ancestor. These are homologous organs which have different functions across diverse forms, but are developed along same pattern. These organs arise due to divergent evolution.