Based on the diagram above, which of the following describes the role of organ a?
a) it enables maternal-fetal blood exchange so the fetus receives oxygen removes nutrients and waste products
b) it delivers oxygen and nutrients and removes carbon dioxide and other waste products through the skin of the fetus.
c) it connects the fetus to the uterus, which is the source of oxygen, nutrients, and waste disposal for the fetus.
d) it provides oxygen and nutrients and removes carbon dioxide and other waste products from the fetus's blood.