Which of the following statements about the two strands of a dna molecule is true? select one: a. the strands are a pair of sister chromatids. b. the strands are connected to each other by sugar-phosphate bonds. c. a t base on one strand always pairs with an a base on the other strand. d. an a base on one strand always pairs with a g base on the other strand. e. the strands have identical base sequences

"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."