Quote from ZZZzzzzzzz:
Actually, the reason is quite clear why the chicken(s) came before the egg.
The hen lays the egg, but the rooster fertilizes it.
Then, the hen keep the egg at proper temperature. Then when the baby chicken is hatched out of the egg, it cannot take care of itself, and needs the mother hen to protect and care for the baby chick.
If an egg came first, with no fertilization, no hen to sit on the eggs, no hen to rear the chick, the chick would not survive.....it is therefore pretty clear that the chicken came first....then the egg.