The chicken and the egg it came from are genetically identical. But when a chicken lays an egg, it's genes are slightly different, having inherited them from the father as well as the mother.
So, the egg comes first.
If we trace back.... a long way.... we come to a point where there is an animal which is the ancestor of a chicken, which we wouldn't call a chicken. There must have been some point along the line where the animal resembled a chicken. But this animal had to come from an egg, which had been laid by an animal which didn't resemble a chicken. So the egg is first!
Or something....*whew*
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