Which came first?

Which came first, the chicken or the egg?

Answer 1 (to emphasize the value of descriptiveness over brevity): Obviously, the egg came first. Current knowledge dates the domestication of the chicken at no earlier than 10,000 years ago, while reptiles pioneered the hard-shelled egg idea about 300,000,000 years ago when they diverged evolutionarily from Paleozoic amphibians (Carroll, Robert L. “Problems of the Origin of Reptiles”Biol. Rev. 1969, 44, pp. 393-432).

Let’s rephrase the question:

Which came first, the chicken or the chicken egg?

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