The ________ prevents large molecules like red blood cells and harmful substances, such as most bacteria and maternal wastes, from entering the fetus.

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The placental wall prevents large molecules and harmful substances from entering the fetal bloodstream. The umbilical cord provides the conduit for the exchange of gases, nutrients, and wastes between the maternal and fetal bloodstreams. The amniotic sheath surrounds the fetus, providing protection and cushioning. The ectoderm is one of the three primary germ layers that give rise to the various tissues and organs of the developing embryo.

The ________ Prevents Large Molecules Like Red Blood Cells and Harmful