Some digestive products, such as water and electrolytes, will be absorbed by diffusion. They diffuse from an area of concentration in the intestinal lumen to an area of concentration in the cells lining the intestine.

High, low

Explanation:

Diffusion always occurs from an area of high to low concentration. It does not require energy.

"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."