Examlex
Because telephone systems use DC, the standard wiring practice is to use the 'tip' as the ____________________ conductor.
Amnion
The innermost membrane enveloping the embryo and containing amniotic fluid.
Yolk Sac
An early development structure in embryos, providing nutrition before the circulatory system and placenta are fully developed.
Umbilical Cord
The flexible tube connecting a fetus to the placenta, delivering nutrients and removing waste.
Blastocyst
An early stage in human embryonic development, a structure formed approximately 5 days after fertilization, consisting of an inner cell mass, a fluid-filled cavity, and an outer layer of cells.
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