What kind of shell does a bird’s egg have? What are their functions?

A bird’s egg is a fertilized egg with a supply of nutrients and water, protected from drying out and mechanical damage on land. In a deposited fertilized egg, the embryo is represented by an embryonic disc located on the surface of the yolk. The enveloped yolk is suspended on mucous cords in the center of the protein. The egg has three outer shells: two parchment shells – shell and shell. At the blunt end of the egg there is an air chamber with a supply of air for the developing embryo. The shell contains pores through which gas exchange occurs between the embryo and the air environment.

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