I'm reading this book right now for one of my classes, "Sophie's World" and they discuss this question as a matter of fact. The book mentioned an "idea chicken" and they asked which came first, the actual chicken, or the idea of the chicken. The "idea chicken" was just a concept that humans came up with after seeing a certain amount of them. Something like that, I didn't completely understand it at the time.

But that doesn't really correlate with the chicken/egg debate.

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Drama kids are cool.
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Churchill Lancers rock the Casbah...
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Sometimes you have to get to know someone really well to realize you're really strangers.
-Mary Tyler Moore

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The greatest thing you'll ever learn is just to love and be loved in return. ~ Moulin Rouge