Final answer:
The part of the blastocyst that promotes implantation and produces hCG is the trophoblast. This layer secretes enzymes for implantation and also forms part of the placenta while producing hCG.
Step-by-step explanation:
The part of the blastocyst that promotes implantation and produces hCG (Human Chorionic Gonadotropin) is the trophoblast. In mammals, the cells in the blastula organize into two layers: the inner cell mass and an outer layer called the trophoblast. While the inner cell mass forms the embryo, the trophoblast secretes enzymes that allow the blastocyst to implant into the endometrium of the uterus. Once implanted, the trophoblast also contributes to the development of the placenta and starts to produce hCG, a hormone vital for maintaining pregnancy.
Learn more about Blastocyst Implantation