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A theory is _____. a theory is _____. a well-supported concept that has broad explanatory power cannot be altered not correct unless it is several years old the same thing as a hypothesis a poorly supported idea that has little backing but might be correct

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GeoPanther

The answer is a well-supported concept that has broad explanatory power.

A theory provides reasoning for why something may occur or explain patterns in behaviour.  Most theories that are accepted by scientists have been repeatedly tested by experiments and can be used to make predictions about natural phenomena.