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Health, 03.05.2021 01:00 katherinemartinez173
Oral contraceptives often contain synthetic estrogens and progesterone for 21 days, and then placebo pills that do not have hormones for days 22-28. Why would this prevent pregnancy? Do such pills prevent ovulation? Do they prevent menstruation? Explain.
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Oral contraceptives often contain synthetic estrogens and progesterone for 21 days, and then placebo...
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