The chorion ________ and the amnion ________.
A. projects into the endometrium and helps form the placenta; is a membrane that encircles a developing embryo
B. is the site from which primary germ layers develop; is the site from which secondary germ layers develop
C. is the part of the blastocyst that is not the inner cell mass; is the inner cell mass
D. is the outer protective membrane around the embryo; is the site where an embryo is implanted into the uterus
Answer: A
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