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04-10-2008, 06:27 AM
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| please help me???????? biology help???
firstly, in an unborn child, there is a hole in the septum between the left and right atria,( which i suppose think it is for oxygen to dissolve in the whole blood fast.) as soon as the baby takes its first breath, this hole closes up. why is this important? please help me...if u at least help i will award u the full points and stars...please?      |
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