The question of which came first, the chicken or the egg, is a classic philosophical and scientific conundrum. From a biological perspective, it’s generally accepted that the egg came first. The reasoning behind this is based on the process of evolution.
The idea is that over a long period of time, a bird that was not quite a chicken laid an egg, and through genetic mutations, the chick that hatched from that egg had some changes that made it genetically closer to what we would now recognize as a chicken. Therefore, the egg that hatched the first true chicken would have come from a bird that was not quite a chicken.
In this context, the egg (containing the genetic mutation that led to the first chicken) came first. The debate often revolves around the definition of a “chicken egg” and whether it refers to an egg laid by a chicken or an egg containing a chicken.