Louis Pasteur by careful experimentation demonstrated that life comes only from pre-existing life.
He performed the following experiment:
He took a pre-sterilised flasks and concluded life did not come from killed yeast. While in another flask open to air, new living organisms arose from ‘killed yeast’.
This experiment of Louis Pasteur dismissed the Spontaneous generation theory once and for all.
However, the experiment of Louis Pasteur did not answer how the first life form came on earth.
Next Oparin of Russia and Haldane of England proposed that the first form of life could have come from pre-existing non-living organic molecules (e.g. RNA, protein, etc.) when primitive atmosphere was present (i.e., high temperature, volcanic storms, reducing atmosphere containing CH4, NH3, etc).
The experiment by S. L. Miller showed that organic molecules could develop from inorganic molecules leading to origin of life.
So Louis Pasteur’s observation can be corrected by Miller’s
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