Final answer:
The umbilical cord contains the blood vessels that join the embryo and its mother.
Step-by-step explanation:
The umbilical cord contains the blood vessels that join the embryo and its mother. It connects the embryo to the placenta in the mother's uterus. The umbilical cord consists of two arteries that carry deoxygenated blood from the embryo to the placenta, and one vein that carries oxygenated blood from the placenta back to the embryo.
Learn more about umbilical cord and embryo development