How did egg white and yolk become chickens in eggshells?

Eggs have yolk, albumen and shell. There is an embryo at the top of the yolk, from which the chicken develops. Egg yolk is rich in fat and protein, which can provide nutrition for developing embryos. Egg white has the function of protecting egg yolk. The eggshell can protect the eggs from natural enemies. There are many small holes in the eggshell, which can let oxygen, carbon dioxide and water vapor pass through and let the chicks breathe. Under suitable conditions such as temperature and humidity, embryos will grow and develop. The fourth day of 1 ~ is the stage of internal organ development, the fifth day of14 is the stage of external organ formation, the fifth day of 15 ~ 19 is the stage of embryo growth, and the chick hatches after 20 ~ 2 1 day.

The attached figure illustrates the whole process of turning eggs into chickens:

This is an egg used to hatch chickens. (Figure 1)

A few days later, bloodshot appeared on the surface of egg yolk. (Figure 2)

Bloodshot aggregation and yolk diffusion. (Figure 3)

Eyes began to appear. (Figure 4)

Eyes are getting bigger and bigger. (Figure 5)

Form the outline of a chicken. (Figure 6)

Grow beautiful feathers. (Figure 7)

It looks like a chicken. (Figure 8)

Further development. (Figure 9)

Finally turned into a lovely chicken. (Figure 10)