Many evolutionists have performed experiments to try to produce living things from common chemicals. All of these experiments have failed. What evolutionary idea are these experiments trying to prove? Tree of life abiogenesis recapitulation gradualism

abiogenesis

Explanation:

Abiogenesis is the idea that supports the thought that the emergence of life is associated with the non-living things. It is believed that initially, the structure of the formation of life was simple. With further process, it turned to be complex. According to this hypothesis, the non-living matter of the Earth gave birth to the living matter.  

In the given excerpt, the experiment performed by the evolutionists by using chemicals is an example of abiogenesis.

"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."

substitution is the answer in this case