Final answer:
The placenta allows for the exchange of nutrients and waste products between the mother and fetus.
Step-by-step explanation:
The placenta serves as a connection between the mother and the developing embryo or fetus in mammals, including humans. Its main purpose is to facilitate the exchange of nutrients and waste products between the mother's and the fetus's bloodstream. The placenta allows oxygen, nutrients, hormones, and antibodies to transfer from the mother's blood to the fetus, while also removing waste products such as carbon dioxide.