Who came first egg hen or chicken?

The Scientific Answer:

* The egg came first. Eggs existed long before chickens. Dinosaurs laid eggs, and over millions of years, evolution led to the development of birds, including chickens.

The Trick of the Riddle:

The riddle plays on the assumption that "chicken" only refers to a modern, domesticated chicken. But a bird with a slight genetic difference from a modern chicken wouldn't technically be a chicken.

The Real Question:

The real question is about the point at which a slight genetic change in an egg would produce an offspring that we would consider a chicken. There's no clear-cut answer to that, as evolution is a gradual process.

In Conclusion:

The answer depends on how you define "chicken." Scientifically, the egg came first. But the riddle highlights the blurry line between different stages of evolution.