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OneShotHelpful t1_jdnnwqu wrote

Reply to comment by afox892 in TIL, the placenta that forms with a fetus isn't created by the mother. It grows from the fertilized egg and some fetuses actually develop outside the uterus attached to the intestines in the body cavity. by darw1nf1sh

> In the type where two sperms fertilize one egg, a fetus can form in addition to the abnormal cystic placenta, but it's typically nonviable.

Typically??

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