DeengisKhan t1_jdmkl4y wrote
Reply to comment by SerifGrey 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
No humans existed that were non placental, that evolutionary trait developed many species before us, we just still make use of that method of birth in our biology because it works well enough to have kept placental mammals in the game.
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