how the chiken breathunder the egg
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Directly under the chicken egg's shell are two membranes. When the eggs are laid by the mother they are warmer than the air, and as they cool the material inside the egg shrinks a little bit. This shrinkage is what pulls the two membranes apart, leaving behind the small air sack that is filled with oxygen.
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the egg shells contains small holes that can not be seen with naked eyes are joined with blood vessels through which chick breath
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