== One can not exist without another == 

 If there was no chicken then there could be no egg consequently if there was no egg then how could the chicken come to be? This question can't be answered because there is no definite source though there is study on subjects like this. People are studying how could the first humans come without both a male and a female. This question has been answered of course. In my opinion the chicken came first because of evolution but many people beg to differ.