What happens during the first trimester? its asking what happens during the first three months in the womb.
a. the major organ systems have started developing.
b. contractions begin in the womb.
c. the fetus develops fully working eyes.
d. rhythmic breathing movements begin.

The major organ systems have started developing.

Explanation:

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"menstrual cycle is a complex cycle that consists of several processes. order of occurrence of steps in menstrual cycle are as follows:

1. high progesterone levels maintain the endometrium lining of the uterus.

2. endometrium lining breaks down and low levels of estrogen stimulate the pituitary to release fsh and lh.

3. fsh and lh stimulates the follicles to develop and the oocyte to produce estrogen.

4. rising estrogen levels suppress fsh production and development of other follicles.

5. a spike in lh causes follicle to rupture.

6. a breakdown of corpus luteum causes progesterone level to drop."