Some areas of the world suffer from increased air pollution because they are surrounded by mountains which can trap warm air above cold air during certain times of the year. What is this known as?
a. A temperature inversion
b. A grasshopper effect
c. Buffer zones
d. AVOC cloud
e. Industrial Ozone smog

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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."