Which came first, the chicken or the egg? 

The chicken of course and it is wrong to assume (as in the question ) that an egg(shell) can create a chicken.  An eggshell can not create a chicken, because a chicken inside the eggshell is more complex than the eggshell carrying it. The only purpose of an egg(shell) is to provide protection and ideal environment to embryo in it, just as a womb of any animal does. The shell is simply a package, and for its creation it needs chicken first.

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