Step 1: Understanding the Concept:
During pregnancy, the developing embryo requires a physical link to the mother for the exchange of materials. Step 2: Detailed Explanation:
The placenta is a temporary organ formed by the association of chorionic villi (fetal part) and uterine tissue (maternal part).
It facilitates the supply of oxygen and nutrients to the fetus and the removal of carbon dioxide and waste products.
It is connected to the fetus via the umbilical cord. Step 3: Final Answer:
The structure is the placenta.