EGG, a natural life-support system by A. Bernales

From the very beginning of times EGGS have symbolized BIRTH and RENEWAL. It goes far back before the Romans and Greeks. EGGS then were incorporated as a sacred sign on the cosmogony of every culture on the Earth.
From shape to content every component of the EGG is an example of perfect construction. Its shape is its STRENGTH. The thinness of the EGG'S SHELL do not interfere with the toughness of its material. If it is broken with one hand you need to squeeze very hard the two ends.
Eggs that never receive the sun rays and just do the cycle of life caged in the dark do not produce such tough shell, instead the whole production of life become weak and breakable.
The EGG's five principal parts provide the entire life-support system for the developing bird's life.  SHELL is made entirely of calcium carbonate. It is porous. There are about 7,000 pores in a chicken eggshell. This porous material allows the transfer of gases through the shell. Just as an animal needs to breath, so does an egg.
Immediately beneath the shell are TWO MEMBRANES, the outer and the inner. These membranes PROTECT the contents of the egg from BACTERIA and PREVENT moisture from leaving the egg too quickly. For example, the temperature of a hen is 106*F, eggs are very warm at the time they are laid. The air's temperature is usually much lower than 106*F, and the egg cools to the temperature of its surroundings. As cooling takes place, the egg's contents contract more than does the shell itself, this creates a vacuum and air is drawn through the shell's pores.
An AIR CELL forms at the large end of the EGG. While the embryo is growing, the shell membranes surround and contain the WHITE or albumen of the egg.
The WHITE provides the LIQUID MEDIUM in which the EMBRYO develops. Then white CORDS
attach to the YOLK SAC. They are called CHALAZAE, made of a special form of protein, HOLD the yolk in the CENTER of the egg. The YOLK as a source of food for the embryo contains all the FAT in the egg. The small WHITE SPOT on the yolk is the GERMINAL DISK. This germinal disk is where the female's genetic material is found.
The gradual development of the imperceptible GERM within the closed shell; the inward working; without any apparent outward interference of force, which from nothing produced an active something gradually evolved into a concrete,living creature, must have been a miracle from the beginning.