Who disproved the theory of spontaneous generation?

The theory of spontaneous generation, the idea that life could arise from non-living matter, was disproved by several scientists over time. However, it was Louis Pasteur, a French biologist, who provided the most significant evidence against this theory in the mid-19th century.

Here are the steps he took:

1. Pasteur designed an experiment to test the theory of spontaneous generation. He boiled a meat broth in a flask that had a long neck which he then bent into an S shape.

2. After the broth was boiled, it was left to cool. The design of the flask prevented any existing microorganisms in the air from reaching the broth.

3. Pasteur observed that no life forms appeared in the broth, even after a long period of time.

4. He then broke the neck of the flask, allowing microorganisms from the air to reach the broth. After a while, he observed that the broth became cloudy, indicating the presence of microorganisms.

5. Pasteur concluded that the microorganisms must have come from the air, not from the broth itself. This disproved the theory of spontaneous generation, as it showed that life could not arise from non-living matter without the introduction of existing life.

This experiment was a significant contribution to the field of microbiology and helped establish the principle of biogenesis, the idea that life arises from existing life.