Answer:
The correct answer is option D. the umbilical cord.
Explanation:
In a pregnancy, an embryo is connected to an organ called the placenta through the umbilical cord.
The placenta is the organ responsible for sending nutrition, oxygen and everything the embryo needs to survive. These things are transmitted through blood vessels found in the umbilical cord.
The baby's waste and carbon dioxide are sent back to the mother's circulation who can remove them from her body.
Because its lungs and liver are not yet formed, the baby will feed and breathe through the umbilical cord that is connected to the placenta.
