Assertion: umbilical cord | /r/CapableOf | replace the yolk sac
Facets:
Source sentences:
text: It forms by the fifth week of development, replacing the yolk sac as the source of nutrients for the embryo.
text: It forms by the fifth week of fetal development, replacing the yolk sac as the source of nutrients for the fetus.
text: It forms by the fifth week of fetal development, replacing the yolk sac as the source of nutrients for the fetus.
text: It forms by the fifth week of fetal development, replacing the yolk sac as the source of nutrients for the fetus.