Final answer:
The statement about the difference between the cytotrophoblast and syncytiotrophoblast is true; the cytotrophoblast forms a layer of individual cells that comprise the chorionic villi.
Step-by-step explanation:
The statement that the difference between the cytotrophoblast and the syncytiotrophoblast is that the cytotrophoblast is a deep layer of individual cells is true. During placenta formation, the cytotrophoblast and syncytiotrophoblast both arise from the trophoblast, which is the outer cell layer of the blastocyst. The cytotrophoblast is comprised of individual cells that proliferate to form the chorionic villi, which further invade the maternal endometrium. Meanwhile, the syncytiotrophoblast forms a multinucleated continuous cell layer without cell boundaries derived from the fusion of cytotrophoblast cells, which facilitates nutrient and gas exchange between the maternal and fetal blood.