The hen incubates the laid eggs for:

An egg on the 2nd day of incubation:

An egg on the 10th day of incubation:

On the 21st day the chick is:

The chick pierces (open) the shell by

Oviparous is an animal whose young develop inside:

Viviparous is an animal whose young develop inside:

The eggs should be incubated at a temperature of:

The blood vessels (appeared) transport the nutritive substances and oxygen to the:

The chick opens the shell by its beak and comes out; this is :

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