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Anatomy
The structure marked A begins to close by what time frame and due to what cause?
Begins to close at 10-15 hours after bih, due to withdrawal of prostaglandins
Begins to close at 10-15 hours after bih, due to expression of prostaglandins
Begins to close 4 weeks after bih, due to fall in oxygen concentration
Begins to close 4 weeks after bih, due to rise in oxygen tension
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