Why do some plants in the tundra retain their dead leaves instead of shedding them?
a. the plants absorb the nutrients in the dead leaves.
b. the dead leaves insulate new buds from the cold.
c. the dead leaves protect them from predatory insects.
d. the dead leaves them survive long periods of drought.

what's the rest of the question

"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."