How does the fetus excrete metabolic waste? a.) the umbilical cord carries the metabolic waste from the fetus to the placenta, where it diffuses into the maternal blood. b.) the placenta carries the metabolic waste from the fetus to the umbilical cord, where it diffuses into the maternal blood. c.) the umbilical cord carries the maternal blood to the fetus, where it diffuses with the fetal blood and exchanges metabolic wastes.
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