The word theory in the theory of evolution does not imply mainstream scientific doubt regarding its validity; the concepts of theory and hypothesis have specific meanings in a scientific context. While theory in colloquial usage may denote a hunch or conjecture, a scientific theory is a set of principles that explains observable phenomena in natural terms.
"Scientific fact and theory are not categorically separable", and evolution is a theory in the same sense as germ theory or the theory of gravitation.
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