Producers are at the start of every A. water cycle
B. cell cycle
C. food chain
D. nutrient cycle

C. food chain.

Explanation:

Producers typically are able to create energy by themselves, with little to no help from outside (other than photosynthesis (sunlight), soil, water, etc.) They also hold the most amount of energy.

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it would be c. xylem.

"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."