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(C) In $1953$,Stanley Miller and Harold Urey conducted an experiment to test the Oparin-Haldane hypothesis of the chemical origin of life.They created

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(C) In $1953$,Stanley Miller and Harold Urey conducted an experiment to test the Oparin-Haldane hypothesis of the chemical origin of life.They created a closed system using a flask containing a mixture of methane $(CH_4)$,ammonia $(NH_3)$,hydrogen $(H_2)$,and water vapor $(H_2O)$.They maintained the temperature of the mixture at $800^{\circ} C$ and provided electrical discharges using electrodes to simulate lightning.This experiment resulted in the formation of simple amino acids,providing evidence for the chemical evolution of life.

In their experiment,Urey and Miller mixed $CH_4, H_2, NH_3$,and water vapor in a closed flask and provided electrical energy at a temperature of ........ to simulate primitive atmospheric conditions. (in $^{\circ} C$)

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