Final answer:
Pasteur disproved spontaneous generation with his swan-neck flask experiment.
Step-by-step explanation:
Pasteur's Swan-Neck Flask Experiment:
Pasteur designed a set of experiments to disprove the theory of spontaneous generation. In his experiment, he boiled broth in a flask with a unique swan-neck shape, which allowed air to enter but prevented the entry of bacterial and fungal spores. The control group consisted of a flask with a broken neck. The broth in the intact flask remained uncontaminated, while the broken-neck flask became contaminated. This experiment demonstrated that the presence of microorganisms in the broth was due to the air and not spontaneous generation.