Problem: How do the levels of reproductive hormones influence the human menstrual cycle? You'll be needing a graph paper and the data below because I don't know how to screen shot with computer and used this link as the image and please give me correct graphing and results please finish it all and Ill give brainiest and 30 points.

Progesterone levels rise during the luteal phase of the ovarian cycle and the secretory phase of the uterine cycle. Menstruation occurs just after LH and FSH levels peak. Menstruation occurs after progesterone levels drop. Estrogen levels rise before ovulation, while progesterone levels rise after.

the answer is:

carbon dioxide

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.