Science hasn't proven anything other than the possibility that the origin of life came from those factors, life could have just as easily came to earth aboard a comet, or from an outside source. In a labratory specific conditions can be recreated in which organic molecules are created from simpler molecules in the atmosphere, combine that with a lipid membrane and you have little bubbles of organic molecules that could have possibly turned into the first cell, it is definitely far from having been proven though, it never will be because we can't go back 3 billion years in time.