Which came first... the Chicken or the Egg?

Which came first.. the chicken or the egg?

Seriously, how is this even a problem? Any 7-year-old can tell you that eggs existed hundreds of millions of years before chickens, so the trivial answer is "the egg came first".

To look at it another way... All chickens come from eggs, but not all eggs come from chickens. So we can therefore imagine a sequence in which a non-chicken lays an egg, and that egg gives rise to a chicken. The alternative (a non-egg gives rise to a chicken) simply does not fit with our experience of  eggs. Or chickens. Or the world.

So, to summarise. THE EGG CAME FIRST.
Thank you.