By what means does respiration take place with the developing bird embryo before it breathes with it's own lungs?
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G.D.Rose says 2017-01-23 07:08:26 (CST)
Big guess, the yolk sac
7 years ago via Forums | Front Porch Forum
Plowboy says 2017-01-23 10:48:00 (CST)
Another W.A.G.--the air cell at the blunt end of the egg?
7 years ago via Forums | Front Porch Forum
JerryHicks says 2017-01-25 04:59:17 (CST)
By means of a circulatory system, connected with but outside the developing chicks body, which extends around the egg just inside the shell and permits the exchange of carbon dioxide for oxygen through the porous shell.
7 years ago via Forums | Front Porch Forum
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