A unifying principle that explains a body of facts is a:

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A unifying principle that explains a body of facts is a theory, as it is an explanation that has been extensively tested and supported by multiple lines of evidence. A law is a statement describing a natural phenomenon, while a hypothesis is an explanation that has yet to be extensively tested or supported. A model can be used to represent a concept or system, but does not necessarily explain a body of facts. A qualitative statement describes properties or characteristics without quantifying them.

A Unifying Principle That Explains a Body of Facts Is