Name the scientist who had used the set-up shown below.Write the purpose of 'a' in the set-up and the conclusion the scientist arrived at

Name the scientist who had used the set-up shown below.Write the purpose of ‘a’ in the set-up and the conclusion the scientist arrived at.

Name of the scientist is S.L.Miller.
Purpose of ‘a’ is to supply electric discharge as a is a substitute of thundering.
Conclusion : Life originates from pre-existing life. It proved the chemical evolution of life.
OR
Chemicals found in the samples drawn from ‘c’ sugar,proteins and amino acids.
It provided experimental evidences for the theory of chemical evolution of life. It proved that life originates from pre-existing life.