what came first, egg or chicken?

i think the egg because is the cell

Some people say that the egg came first since the chicken evolved from something else, which had already had eggs, but that simply opens the next question - in that species, which came first? Tracing it right back, which would have originated first? I think that the chicken would plausibly have come first, since, following the theory of evolution, we started evolution as bacterium that reproduced without eggs; as they evolved, so they evolved into species with the capacity to produce eggs; if there is an egg, it must have been laid by something!