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Although you cannot see it with the naked eye, there is a small spot on the yolk of the egg called the Germinal disk. Prior to the formation of the shell, a sperm cell will attach itself to this disk. The shell is formed around the yolk and albumen as it travels down the oviduct.

Under the right temperature and humidity conditions (incubation), that combining of germinal disk and sperm will start the embryo forming.

I have provided a link that shows the actual day to day formation of an egg to a chick.

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16y ago

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