Million dollar quesion: Egg came first or Chicken !!!!

The 1 million-dollar question " Egg  came first or the chicken?" resurrected some days back in my head. 

Chicken or egg? Each attempt at an answer just leads to another question. If the chicken came first, then didn't it hatch from an egg? And if the egg came first, wasn't it laid by a chicken? It's one of those questions that seem unanswerable.

Scientists agree on where chickens came from: In a sense, human beings invented them, just like they invented cows and pigs and other domesticated animals on Old MacDonald's Farm.

If chickens were interested in tracing their family trees, they would need to bone up on some DNA research. Every chicken that ever lived can trace its ancestors, say researchers, to a particular subspecies of Red Jungle Fowl in Thailand.

Scientists think the first domestic chickens were bred from Red Jungle Fowls more than 8,000 years ago in the region now divided into Thailand and Vietnam. People bred chickens first for cockfighting contests, later for eggs and meat.

So the first official "chicken" pecked its way out of an egg laid by a bird that was not-quite-a-chicken. Depending on how you look at it, the egg--or the wild chicken--came first.

In creating the domestic chicken--and coming up with some 175 varieties--human beings also created a world where chickens rule the breed: There are more chickens than any other kind of domesticated bird on Earth.

And where did birds come from? Scientists think that a group of egg-laying feathered dinosaurs were probably the ancestors of today's birds. So if it weren't for dinosaurs, there wouldn't be any Jungle Fowl OR chickens.

So looks like  the riddle of where chickens came from, is solved. But wait, there's still the question of where eggs came from.

Scientists say eggs--handy miniature incubators of life, nutrients already packed inside--evolved more than 1 billion years ago, in the oceans of Earth when land animals evolved and their eggs had a tough covering to retain moisture on dry land. 

So may be  "the egg" came first on the earth

 The Crux is : 

The chicken came after the bird, the bird came after the dinosaur, the dinosaur came after the egg. And the egg came long after the first single-celled bacteria, the prokaryotes, evolved in the oceans, some  billion years ago.