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because oxygen was not present in the early earth.
Miller and Urey
He deliberately left out oxygen knowing it would destroy the amino acids he was trying to make.
I think you have Miller and Urey confused with someone else.
Miller and Urey set out to test a part of Oparin's hypothesis on the origin of life.
To my knowledge: Miller And Urey Modle The conditions by Laboratory Experiments
The Urey-Miller experiment showed that organic compounds could arise from inorganic compounds. ~VietPride
Miller and Urey's experiments attempted to demonstrate the chemical origins of life. They first conducted the experiment in the year 1953.
A simulation of the origin of life.
A simulation of the origin of life.
Lightning.
Amino acids