how does egg get oxygen
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As the developing chick grows it uses the oxygen from the air sack and replaces it with carbon dioxide. The tiny pores in the shell allow the carbon dioxide to escape and fresh air to get in. The chicken egg has more than 7,000 pores in its shell to allow this to happen
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Oxygen and nutrients from her blood made their way down your umbilical cord, through your belly button, and fueled your body. ... There's no way for the hen to get her still-developing offspring the oxygen it desperately needs; the pre-hatchling is on its own.
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