a) S – Umbilical vein;
T – Umbilical artery;
b) Q – Carbon (IV) oxide;
Nitrogenous wastes;
R - Oxygen;
- Nutrients;
- Hormones;
- Antibodies;
c) The delicate blood vessels of the foetus would not burst due to the higher blood pressure in the material circulatory system;
d) i) Progesterone;
ii) Maintains pregnancy;
sharon kalunda answered the question on September 17, 2019 at 13:48
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