MadSci Network: Evolution |
This question is really impossible to answer, as the evolution of the chicken was a gradual process that took place over time. Over the course of evolution, small changes in the organism (the ancestor of the chicken) and the organism's reproductive mechanism (what would eventually be known as the egg) occur to result in what we see today as a chicken. Thus, before the chicken and the egg there was something like a chicken and something like an egg, and going back further there was something a little less like a chicken and something a little less like an egg. Therefore, it is really impossible to give a straight answer to this question.
Try the links in the MadSci Library for more information on Evolution.