PurpleSignificant725 t1_jdmooo5 wrote
Reply to comment by Mammoth-Mud-9609 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
And those 40 cells differentiate into 3 subtypes prior to beginning their development. Gestation is wild
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