How did Louis Pasteur disprove through his experiments the spontaneous generation theory?
In 1668, Italian physician Francesco Redi first performed tests
with rotting meat that showed that maggots did not form
spontaneously as was previously thought. It suggested that living
things could only be formed from living things of the same
Louis Pasteur in 1861 improved upon the experiments of John
Needham, who in 1745 had suggested that living things could form
despite sterilization of the medium. Pasteur boiled solutions in
beakers that had necks shaped like an S, so that airborne
microorganisms could not reach the solution past the neck. Mold did
not appear in the unexposed liquid that was boiled, but did in the
solution that was exposed to bacteria from the air.