Controlled experiments are experiments that have only one variable. All other factors in the experiment are kept the same. Many hypotheses can be tested through controlled experiments, but it is not always possible to do a controlled experiment. Which of the following hypotheses most likely cannot be tested with a controlled experiment? A. A flowering plant will produce more fruit when treated with phosphate powder. B. Ultraviolet radiation can cause genetic mutations in bacteria. C. Gravitational force is affected by both mass and distance. D. In the wild, chimpanzees form social groups composed of 10 to 20 individuals.

"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."

the answer is c. it will give up it's valence electron to the other atom.