Question

why are the miller-urey experiments essential to the theory of evolution?
they showed that life can only come from life
they showed that electricity can create life.
they showed how organic molecules could be made from earths early atmosphere
they showed the role that natural selection played in the evolution of modern day organisms.

Explanation:

The Miller-Urey experiments simulated Earth's early atmosphere (methane, ammonia, water vapor, hydrogen) and used electric sparks to mimic lightning. They produced organic molecules (e.g., amino acids), which are building blocks of life. This supported the idea that organic compounds could form abiogenically (from non-living matter) on early Earth, a key step in the origin of life and evolution.

Answer:

They showed how organic molecules could be made from Earth's early atmosphere