Cellulose is found throughout the cell walls of plant cells. cellulose makes cell walls rigid. why does it make the walls rigid?

Because it forms beta arrangements subsecuently forming microfibrils

Explanation:

Cellulose is a complex carbohydrate formed by a long polysaccharide of glucose molecules with beta arrangements, these give a flat and rigid structure that held to each other through hydrogen bonds forming microfibrils that give their rigidity to the cell walls (you can see this structure in the image added).

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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."