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 environment 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 turning pink because of the formation of some organic compounds.