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Theory

usgb/ˈθiːəri,ˈθɪri/Volume
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Not Always Proven

Theories in science are well-substantiated explanations, but not always proven facts.

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Darwin's theory of evolution remains a robust scientific framework.
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Broad Explanations

Theories aim to explain broad patterns or phenomena, not isolated events.

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The germ theory of disease explains how diseases are transmitted.
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