observation, The broth (seems be isolated by cork) rancid after a while, question, Where are the microorganisms that cause the soup to spoil?, Research, look up the information, Hypothesis, The microbes are in the air, not in the soup that has been boiled, experiment, Put the broth into a glass bottle and boil ,then seal the bottle with heat (completely airtight), data, A few days --- the broth isn't spoiled, conclusion or another hypothesis, Reformulate hypotheses based on experimental data.

science methodology

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