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,

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