In general, what happens to the hormone levels between days 21 and 27, just prior to menstruation if the egg was not fertilized?

If the egg is not fertilized, the corpus luteum breaks down near the end of the cycle. It stops producing as much progesterone and estrogen, so these hormone levels generally decrease between days 21 and 27, just before menstruation. The correct choice is “Hormone levels generally decrease.”

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