Why does weather vary from day to day? A. because cold fronts are always followed by a series of colder fronts, before a warm front returns

B. because weather is a complex interaction among many different variables that are constantly changing

C. because the rotation of the Earth causes the atmosphere to expand and contract as it nears the Sun or Moon

D. because the Sun's energy heats all parts of the Earth evenly but does not heat the atmosphere

B. Because weather is a complex interaction among many different variables that are constantly changing

what's the question?

"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."