The egg. The modern chicken is generally believed to be a "descendant" of Archaeopteryx, the oldest known bird. This 150-million-year old resident of the Jurassic Period laid eggs and at some point evolved into an animal that was one generation away from being a proper chicken. This creature would have produced the egg of which the first chicken emerged. Therefore, the egg came first.
Condensed from the (Reader's Digest Magazine)
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