Well, a chicken can’t flutter out of thin air, so a chicken must come from an egg. In fact, it has to come from a chicken egg. But the very first chicken egg doesn’t have to be laid by a chicken. It could be laid by a protochicken which is not a chicken, but by a fluke of evolution can give birth to chickens.
Plus, as Martin points out, there were eggs long before there were chickens. So the egg came first.
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