How is the placenta formed? What are its functions?

The placenta is a temporary organ that forms during pregnancy in most mammals, facilitating the exchange of nutrients, gases, and waste products between the mother and the developing fetus. Its formation begins with the implantation of the fertilized egg, or zygote, into the uterine wall. The outer layer of the blastocyst, called the trophoblast, differentiates to form the chorion, which interacts _______ ________ ________ _____ _________ ________ ______ __________ ____.
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