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Most probably because the original theories are based on a certain amount of truth. Now a days, theories are not accepted until there is a significant amount of evidence to back it up. If there should be new evidence that states otherwise, then the theory will be modified.

Of course, this is not a black and white situation. Not all theories have been "modified." Some have been completely discarded when solid facts have proved otherwise. For example, the Flat Earth Theory and the theory that the Earth is the centre of the universe.

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11y ago

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