The placenta allows unborn babies to obtain oxygen and nutrients and exchange waste products with their mother.
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Q2: Estrogen controls secondary female sex characteristics such
Q3: Testosterone determines the primary and secondary sex
Q4: We tend to classify estrogen as female
Q5: The vagina is part of the external
Q6: At the end of the first trimester,
Q8: Vaginal delivery is not risky for an
Q9: The sponge is a hormonal method of
Q10: A vasectomy prevents the production of sperm.
Q11: With fertility awareness, monitoring body temperature is
Q12: Both men and women experience the refractory
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