Open Question: After fertilization what is the correct order of events?
A. Embryo secrets HCG -> Implantation of embryo in uterine wall -> Stimulates corpus luteum to grow
B. Implantation of embryo in uterine wall -> Stimulates corpus luteum to grow -> Embryo secrets HCG
C. Implantation of embryo in uterine wall -> Embryo secrets HCG ->Stimulates corpus luteum to grow
D. Continued secretion of progesterone and estrogen -> Embryo secrets HCG -> Stimulates corpus luteum to grow -> Implantation of embryo in uterine wall
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