Implantation of a blastocyst
A. requires the presence of high concentrations of follicle-stimulating hormone (FSH).
B. takes place at a time in the typical menstrual cycle when estrogen concentration in the blood is higher than progesterone concentration in the blood.
C. normally occurs within the oviduct (fallopian tube).
D. normally begins around day 21 of the typical menstrual cycle.
E. occurs within 24 hours of fertilization of the oocyte.
Answer: D
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