With the help of neat labelled diagram explain Stanley Miller's experiment in support.

Explanation

Urey-Miller Experiment
Harold Urey & Stanley Miller conducted an experiment to prove theory of chemical evolution.
They created a condition similar to that of primitive earth (i.e. high temperature, volcanic storms, reducing atmosphere devoid of oxygen but containing compounds of carbon, hydrogen, nitrogen and water.
They made electric discharge in a closed flask containing `CH_4, NH_3, H_2` and water vapour at `800^@ C`.
As a result, some amino acids were formed.
In similar experiments, others observed formation of sugars, nitrogen bases, pigments and fats.