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(A) The correct option is $A$. Stanley Miller and Harold Urey supported the chemical origin of life theory proposed by Oparin and Haldane. In their ex

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$CH_4, NH_3, H_2O, H_2$

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(A) The correct option is $A$. Stanley Miller and Harold Urey supported the chemical origin of life theory proposed by Oparin and Haldane. In their experiment,they used a mixture of methane $(CH_4)$,ammonia $(NH_3)$,hydrogen $(H_2)$,and water vapor $(H_2O)$ in a ratio of $2:1:2$. These gases were chosen to simulate the reducing atmosphere of the primitive Earth.

The primary gases that were used by Miller in his experiment are

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