Without sufficient the colon gets too little exercise and becomes weak.

Fiber.

Explanation:

Fiber is also known as roughage, a type of carbohydrate that cannot be broken down into simple sugars. Fiber helps in digestion, cholesterol maintenance and blood sugar regulation.

Fibers can pass through the intestine relatively intact. Dietary fibers increase stool bulk and aids in digestion process. Fiber deficient diet or very less fiber can cause little exercise of colon and becomes weak.

Thus, the answer is fiber.

"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."