<|im_start|>user
What came first, the egg or the chicken?<|im_end|>
<|im_start|>assistant
The egg came first. Eggs existed well before chickens. The oldest fossils of dinosaur eggs and embryos are about 190 million years old. The oldest fossils of chickens are only about 50 million years old.

So, what laid the first chicken egg? It was probably a bird that was very similar to a chicken, but not quite a chicken. This bird would have laid an egg that contained the genetic mutation that made it a chicken. The first chicken hatched from this egg.<|im_end|>
