one theory stae,tes that the compounds needed came from reactions invoving hydrocarbons and ammonia with lighting providing energy
all the theories about how life started on earth are unproven and so we cannot be sure how life began
Miller and Urey did and experiment based on what scientist thought was in the early atomosphere. used:
mixture of water,ammonia,methane, hydrogen and a high voltage spark to simulate lightning
after a week they found that amino acids the buling blcoks for proteins had been produced
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