Secondary succession is the regrowth of a disturbed area, and primary succession is
the development from the begining. which of the following is primary succession?
o changing ice to water
o changing soil to rock
formation of an island by volcanic action
o
changing rock to soil
growth after a forest fire

"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."

correct answer is a. and d.