Threre is an old problem in evolving theory, but also a paradox in logic: which born first, the chicken or the egg? In formal logic the problem is a paradox, is not it?
I read an article somewhere(i cannot remember the source) that the chicken came first. They explain that eggs contain a protein found (produced ?) only by chickens.
Of course It is a paradoxial question. "If the chicken came first, where did it came from ? " Question like this arises.
The egg came from a proto-chicken; an organism that ressembles closely to the chicken we know now