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For a theory to exist, it must start as a hypothesis, go through vigorous testing and re-testing, and remain true throughout the testing. If the hypothesis remains true, then it can be identified as a theory. If it does not, the scientist must return to his hypothesis to alter it or completely start over.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref>
For a theory to exist, it must start as a hypothesis, go through vigorous testing and re-testing, and remain true throughout the testing. If the hypothesis remains true, then it can be identified as a theory. If it does not, the scientist must return to his hypothesis to alter it or completely start over.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref>
== Alternate usage ==
Scientists also speak about tentative theories that may have had little or no testing. For them, a theory is just a connected set of hypotheses that is worthy of scientific consideration. For example, they may discuss [[String Theory]] or a theory of extraterrestial intelligence, even though these theories have no supporting evidence.
==References==
==References==
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