What is implantation, and what role do trophoblast cells play in this process?

• A. Implantation is the process of fertilization, with trophoblast cells responsible for forming the embryo.
• B. Implantation is the attachment of the blastocyst to the uterine wall, with trophoblast cells aiding in embedding the embryo into the endometrium.
• C. Implantation refers to the division of the embryoblast, with trophoblast cells forming the placenta.
• D. Implantation is the shedding of the uterine lining, with trophoblast cells involved in menstruation.

Answer: (B)