by 
Anonymous
ANSWERS: 2
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It would depend on when the 8 celled structure formed after fertilization separates to differentiate into twins. Later than first week separation increases the chances of same placenta.
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"Identical twins develop when a fertilized egg splits. Depending on when the split occurs will determine if the twins share a placenta, with either one or two chorions and amnions, or if they each develop their own placentas. In general, the later the spit occurs, the more likely that the twins will share one placenta."
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