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A _________________ is developed through the scientific method, and it can be modified or improved upon. It may be represented by a model. As seen here, three different models were used to represent atomic structure as ideas changed over time.

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A simple answer to this "a theory".

User Painedpineapple
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I think that the best phrase to fit into the blank is a "scientific theory".

A scientific theory is developed through experiments which use the scientific method, and a theory can be improved if additional data is available or if people provide suggestions which make the theory fit the data better.
User Astiefel
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