All theories are hypotheses, but not all hypotheses are theories. Francis wants to know if a specific hypothesis he is researching is a theory. Which describes how Francis would know the hypothesis is a theory?

A scientific theory is a well-supported explanation that has been tested repeatedly and is supported by evidence. Francis should check whether the hypothesis has been supported by repeated experiments, rather than treating it as a fact or changing data. Designing one new controlled experiment could test the hypothesis, but would not by itself show that it is already a theory.

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