Miller & Urey has performed an experiment to the proof chemical origin of life. They postulated that first organic cell would have been produced from inorganic (chemicals) substances.

They took a glass jar and tried to create an internal environmnet same as that of earth's environment billions of trillions year ago.

In a sterile jar they insert methane(CH₄), hydrogen(H₂), water (H₂O) & ammonia(NH₃). They heat the jar to increase its temperature to match up the earth's temperature million years back & also increases the pressure. They even provided some electric current to that jar. After some days, the solution starts turnng pink because of the formation of some organic compounds.