The short answer: Chicken.
The long answer is contained in the analysis called Structural Control of Crystel Nuclei by Eggshell Protein, published by Colin Freeman and John Harding of the University of Sheefield.
“It had long been suspected that the egg came first, but now we have the scientific proof that shows in fact the chicken came first,” said Freeman. The analysis says that what came first was particular chicken protein found in bird's ovaries that maintain crystal growth and the system that they used to be able to virtually spawn an eggshell overnight.
The protein (OC-17) has been known to be found only in the hard parts of a shell but until now, scientists have long been trying to find out how it contributes to the building of eggshells.
Using the UK national super computer to simulate this process, scientists have found that the OC-17 protein sometimes manages to just fall off on its own, this elegant process results in detaching, and more formation that creates an eggshell as quickly as 24 hours.
So it's official, the chicken arrived first!
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