It is appropriate to criticize a scientific theory by saying "it's only a theory" because it is a tentative explanation that accounts for the existing data.

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The phrase "it's only a theory" is often used to dismiss scientific theories as if they are mere guesses or speculations. However, in science, a theory is a well-established explanation that has been tested repeatedly and has not been disproven. Therefore, it is not appropriate to criticize a scientific theory in this way.

It Is Appropriate to Criticize a Scientific Theory by Saying