The correct answer is D. Transfers nutrients and oxygen from the mother's bloodstream to the embryo/fetus.
Explanation:
The placenta is an organ to which the fetus or embryo is attached through the umbilical cord. This is essential for the development of the fetus or embryo because through this blood with nutrients, oxygen and hormones from the mother is transferred to the fetus or embryo. Additionally, this removes wastes from the bloodstream of the embryo/fetus. This organ is essential during pregnancy but once the baby is born this is no longer necessary. According to this, the option that best describes the placenta is D considering the main role of this organ is to transfer essential substances such as nutrients and oxygen from the mother to the embryo or fetus.
