the structure of an eggshell is revenaled as a tangled network of mineralized fibres in the scanning electron micrograph at magnification of 500 times.
eggshell forms around a mat of proteins,
which is coated and overgrown by calcium carbonate and other mineral salts.
the result is a tough, waterproof package that still allows gas exchange
between the inside and the outside,enabling the developing embryo to “ breathe ”, while providing astonishing mechanical strength.