An important developmental event at 9 weeks gestational age is that the
A. testes of a male embryo begin to produce androgens and that alters the development of the genitalia into a male reproductive system.
B. ovaries of a female embryo begin to produce estrogen and that alters the development of the genitalia into a female reproductive system.
C. conception implants in the lining of the uterus and establishes a connection with the maternal system.
D. placenta begins to function and now brings nutrients and oxygen to the developing embryo.
Answer: A
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