The placenta is a very important organ that exists during the development process of the embryo. Now, there are many important functions of the placenta, but before we discuss the functionality of the placenta, let's actually focus on how the placenta is developed. So, during early embryological development, we have a process known as implantation take place. And during that process, the blastocyst actually implants itself onto the endometrium, the lining of the uterus. Now, as soon as implantation takes place, the Trophy blast cells of that blastocyst begin to produce digestive enzymes. And these digestive enzymes are released into the surrounding tissue of the endometrium.