question_answer

In the developmental history of mammalian heart, it is observed that it passes through a two?chambered fish?like heart, three?chambered frog?like heart and finally four?chambered stage. To which hypothesis can this above cited statement be approximated                                         [CBSE PMT 1998]

A) Biogenetic law                                    

B) Hardy Weinberg law

C) Lamarck's principle                            

D) Mendelian principle