Why are all the miller-urey experiments essential to the theory of evolution? a. they showed that life can only come from life. b. they showed that electricity can create life. c. they showed how organic molecules could be made from earth’s early atmosphere d. they demonstrated the role that natural selection played in the evolution of modern day organisms

The correct answer is option C, that is, they showed how organic molecules could be produced from Earth's early atmosphere.

The key point in the Miller-Urey experiments is that they demonstrated the synthesis of composite molecules, that is, amino acids and others through non-living precursor mechanisms. Thus, they tested the chemical origin of life under those environmental conditions.

the correct answer is b