The supporters of this theory stated that life did not come from outer space. Rather there was a natural spontaneous generation of the living organisms from non-living matter present on earth.
Explanation:
For example, they believed that the decayed and rotting material like mud, straw, etc. had the capacity to give rise to organisms like frogs, flies, etc. However this concept was experimentally disproved by many scientists. One of them was Louis Pasteur. Louis Pasteur by careful experimentation demonstrated that life comes only from pre-existing life. He showed that in pre-sterilized flasks, life did not come from killed yeast while in another flask open to air, new living organisms arose from killed yeast.
