Q: What causes the menstrual cycle to be repeated?


Read this paragraph and choose the correct option from the provided answers:

The menstrual cycle is a series of changes in the reproductive system of mature females that repeats every month on average. It includes changes in the uterus as well as development of an egg and ovulation. If fertilization does not occur, menstruation occurs and the cycle repeats.

 Choices:

- gravity

- uteris

- ovaries

- lack of fertilization


A:
lack of fertilization