BI-2188
Fertilisation and early development
Biology · Secondary 4 · Medium · Fertilisation and early development
At the placenta, substances are exchanged between the mother’s blood and the fetus’s blood. Which statement about this exchange is correct?
- Oxygen and nutrients diffuse from the mother’s blood into the fetal blood through the placenta.
- The mother’s blood and the fetus’s blood mix freely inside the placenta.
- Carbon dioxide diffuses from the mother’s blood into the fetal blood at the placenta.
- The placenta blocks all harmful substances from entering the fetus.
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