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How is an egg shell formed?

Egg shells are formed by a complex interaction between a mother and her developing embryo(s). There are several layers in an egg shell, each with a different function. The outmost layer, what we usually think of as the shell, must protect the embryo and allow the passages of certain gasses (so that the embryo can breathe). Different egg shells are made from slightly different materials; notice how a chicken egg is much more rigid than, say, a snake egg. Hope this helps you, Tim.

Ethan Allen

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