Which part of the mammalian blastocyst will eventually become the embryo itself and its surrounding membranes?
A - The ICM
B - The blastula
C - The morula
D - The trophoblast cells
Answer: A - The ICM
The ICM are the internal cells of the morula that will eventually become the embryo itself. The external cells are the trophoblast cells which play a key role in the implantation of the embryo into the uterine wall, when it will become the chorion or placenta.