Cobalamin, more commonly called vitamin b12,
a. was one of the first parts of the b complex group to be discovered.
b. is found abundantly in plant foods.
c. is essential in the synthesis of dna and in the development of red blood cells.
d. when taken as a supplement, will increase metabolic functions, such as endurance performance.

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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."