Which similarity exists between Redi's and Pasteur's experiments on spontaneous generation?

• A. Both experiments involved the use of swan-necked flasks to prevent contamination.
• B. Both scientists proved that microorganisms can arise from broth exposed to air.
• C. Both experiments relied solely on microscopic observation to detect new life forms.
• D. Both used controlled experiments to demonstrate that life does not arise spontaneously from nonliving matter.

Answer: (D)

Verified step by step guidance

1. Step 1: Understand the historical context of spontaneous generation, which is the idea that living organisms can arise from nonliving matter without parental organisms.
2. Step 2: Review Francesco Redi's experiment, where he used meat in jars covered with gauze to show that maggots on meat came from flies, not spontaneous generation.
3. Step 3: Review Louis Pasteur's experiment, where he used swan-necked flasks containing broth to demonstrate that microorganisms come from the environment, not spontaneously from the broth itself.
4. Step 4: Identify the commonality between both experiments: they both used controlled experimental setups to test the hypothesis of spontaneous generation by preventing contamination from external sources.
5. Step 5: Conclude that the similarity lies in their use of controlled experiments to disprove spontaneous generation, rather than relying solely on observation or specific apparatus like swan-necked flasks.