When in the development of science an old theory's laws are found to be explainable in terms of the laws of a more basic theory, then the latter theory has _________ the former.

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When a more basic theory's laws can explain the laws of an old theory, the former theory has "reduced" the latter. This is because the laws of the old theory have been shown to be a subset of the laws of the more basic theory.

When in the Development of Science an Old Theory's Laws