What group of Echinoderms has long, hollow spines that help them move around? A. Sand dollar
B. Sea Cucumber
C. Sea Star
D. Sea Urchin
E. All of the above

"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."

some inherited genetic mutations can be good for the offspring, so the answer is different genetic mutations cause many forms of cancer.