Recent evidence from polar ice core analysis shows that, until now, carbon dioxide levels have never exceeded ppm in the last several hundred thousand years.

Scientists have been doing several experimentation and discovery of the changes of the ice on the pole. Recent evidence from polar ice core analysis shows that, until now, carbon dioxide levels have never exceeded 300 ppm in the last several hundred thousand years.

"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."