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How do birds get oxygen inside the eggs?

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How do birds get oxygen inside the eggs?
posted Jul 4, 2018 by Salil Agrawal

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Directly under the egg's shell are two membranes. When the eggs are laid by the mother they’re very warm, and as they cool the material inside the egg shrinks a little bit. The two membranes pull apart a little and create a small pocket or sack of air. As the developing bird grows, it breathes in oxygen from the air sack and exhales carbon dioxide. Several thousand microscopic pores all over the surface of the egg allow the carbon dioxide to escape and fresh air to get in. These pores also allow moisture to get into the egg to keep developing bird and the egg parts from drying out.

answer Jul 4, 2018 by Hanifa Mammadov
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