Answer:
The fetus excretes metabolic waste through the placenta. Blood from the fetus moves through capillaries in the umbilical cord to the placenta.
Step-by-step explanation:
Through the blood vessels in the umbilical cord, the fetus receives all the necessary nutrition, oxygen, and life support from the mother through the placenta. Waste products and carbon dioxide from the fetus are sent back through the umbilical cord and placenta to the mother's circulation to be eliminated.