Question

which causes a drop in female hormone levels?
○ the onset of the menstrual flow
○ the release of an egg from the ovary
○ the thickening of the uterine wall
○ the failure of an egg to be fertilized

Explanation:

To determine what causes a drop in female hormone levels, we analyze each option:

• The onset of menstrual flow is a result of hormone changes, not the cause of the drop.
• The release of an egg (ovulation) is associated with a surge in hormones, not a drop.
• The thickening of the uterine wall is caused by hormone increases (estrogen and progesterone), not a drop.
• If an egg is not fertilized, the corpus luteum degenerates, leading to a drop in progesterone and estrogen levels, which triggers the menstrual cycle and the drop in hormone levels.

Answer:

D. the failure of an egg to be fertilized