Which came first the chicken or the egg?

Darwin's theory; the chicken egg came from a different species. 
A chicken could not have its genetic material altered during life, so the egg must have evolved and been first. 
If you take into account the doctrine of evolution, the egg's coming first becomes plausible on the cellular level under perfect circumstances (abundant food and resources). There will be an a-sexual reproduction once the environment becomes unfavorable. The species would then evolve, and a lot of animals have no parental instincts but through evolution some have started to look after their young. 
An a-sexual reproduction is reproduction in which there is no fusion of male and female sex cells gametes. 
The egg came first because the chicken descended from a dinosaur, and it laid an egg that was changed from Darwin's theory. 
The egg came first because a chicken comes from an egg. At whatever point you decide to call the chicken a true chicken, it must have come from an egg. Because the different species before it must have evolved to make a chicken, the egg came first.

THE CHICKEN CAME FIRST:

Using Literature, the chicken comes first. 
Using grammar, "the chicken" comes first in the sentence (They come before the words, "the egg".). 
In a dictionary, the word "chicken" comes before "egg". 
God created the chicken first. 
In the seven days that God created the earth, it makes no mention of animal's eggs. Thus, the chicken came first. 
The chicken came first because, if the chicken didn't come first, there would be no egg or care for it. So, God had to make the chicken first.

NEITHER THE EGG NOR THE CHICKEN CAME FIRST: 

There is no answer.Since the question is a paradox, there is no answer. If the chicken came first, it came from the egg. If the egg came first, then it came from a chicken, and so forth. 
There is no correct answer that can be proven. It's all theory. 
Evolution suggests that both chickens and eggs evolved from creatures and "egg-things" you would not recognize to be part of the lineage. (Similar to how, in the very distant past, some molecule[s] that was [were] not what we would call "life" became "life".) That was the beginning. 
The rooster came first.Neither the chicken or the egg came first. It was the rooster who came first. 
The egg and the chicken came at the same time.The chicken and the egg are just two different names for the same process or being. It's like water becoming ice is still water, and vice versa. Well, you could also put it as a circle has no beginning.

Each of us has many, many maps in our head, which can be divided into two main categories : maps of the ways things are, or the realities, and maps of the way things should be, or valves. We interpret everything through these mental maps. We seldom question their accuracy; we're usually even unaware that we have them. We simply assume that the way we see things is the way they really are or the way they should be. And our attitudes and behaviors grow out of those assumptions. The way we see things is the source of the way we think and the way we act. Depending on whether people believe the scientific theory or even common folks' beliefs that whether a chicken or the eggs comes first or even don't believe in neither one of it, it all depends on our paradigm that changes how we see our world and how we live.