The egg. Birds’ eggs (and, indeed, other types of eggs) precede chickens in the evolutionary timeline (it was not specifically stated in your question that ‘the egg’ exclusively referred to chicken eggs 😉 ).
What I like about this saying is how, when we hear it, we assume that the chicken and the egg are part of the same species (even though that’s not specified at all, we just ‘hear’ it that way). If, say, we had a chicken and a dinosaur egg, then it would be absolutely clear the latter came first.
A pre-chicken laid an egg that a chicken came out of, who then laid chicken eggs… (Ok, I admit it it, everyone already gave good answers, I’m just filling 🙂 )
The egg. Unless you believe that a species can mutate during its lifespan, then the first animal that we call a ‘chicken’ today must have hatched out of an egg.
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