The process of changing a higher form to a lower form is called a. claudication. b. contracture. c. crepitation. d. degeneration.

D. degeneration.

Explanation:

The term degeneration refers to the notion that species can return to a primitive state over time - a process that would be opposed to biological evolution. That is, according to degeneration a species may move out of its higher form and back into a lower, less evolved form.

In short, degeneration occurs when through the loss of characteristics that allow an organism to evolve evolutionarily, it loses beneficial qualities, such as strength and intelligence, and returns to a primitive state.

"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."

the tricuspid valve is present between right atrium and right ventricle