How Birds-To-Be Get Oxygen Inside Eggs

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https://www.youtube.com/watch?v=w-M33PtwtM4 Your body needs oxygen to function — and that was true even before you were born. As you grew inside your mother's womb, even before you had working lungs, your cells were crying out for oxygen. And your mother kindly answered that call. Oxygen and...
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How Birds-To-Be Get Oxygen Inside Eggs

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