Analyze the roles of the embryoblast and trophoblast in the blastocyst.

• A. The embryoblast forms the embryo, while the trophoblast contributes to forming the placenta.
• B. Both the embryoblast and trophoblast contribute to forming the placenta.
• C. The trophoblast forms the embryo, while the embryoblast contributes to forming the placenta.
• D. Both the embryoblast and trophoblast form the embryo.

Answer: (A)