Which came first, the chicken or the egg?
Technically, the egg.
I assume that “egg” means “chicken egg”. Here’s why the egg came first:
Once upon a time, chickens were a different species. A bird of that different species laid an egg which had mutated DNA. That egg was the first chicken as we know them today. It was an egg before it was a chicken.
If the question is taken in a more metaphorical sense, it’s harder to say. Chickens were once bacteria that didn’t lay eggs. At some point there was a type of living organism that laid some egg-like thing. So you could say that the chicken came first, because there were living things before there were eggs, or even egg-like things. The first living things reproduced by splitting, not birth. Many living things still do that today, you just can’t see them.
Grammatically, the chicken came first, because it was first in that sentence. Ha ha ha, I’m so funny.