All of the statements about bacteria are true except one. which statement is not true?
a. a number of useful pharmaceutical drugs are made by bacteria.
b. bacteria are thought to be the first group of photosynthetic organisms.
c. bacteria are the only group of organisms that can fix nitrogen into the soil.
d. the majority of bacteria on earth can cause disease, if given the opportunity.

"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."