Some brightly colored rain forest frogs are very poisonous. their toxins can be so deadly that an amount equal to three grains of salt can kill a 150 pound human. Desert cacti have spines instead of leaves. one species has sharp has sharp spines three times longer than the body of cracti. These structural adaptations most likely help rain forest frogs and Desert catic to survive by aiding in which life function A. reproduction
B. catching prey
C. conserving energy
D. avoiding predators

"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."