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** Able to begin pulmonary ventilation, rebreathing the 'air cell' gas.
 
** Able to begin pulmonary ventilation, rebreathing the 'air cell' gas.
 
** Transition from diffusive respiration through the chorioallantois to breathing through the lungs.
 
** Transition from diffusive respiration through the chorioallantois to breathing through the lungs.
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== Heat Transfer to the Egg  ==
 
== Heat Transfer to the Egg  ==
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