Final answer:
A scientific theory is a supported explanation of natural phenomena based on substantial evidence and observations.
Explanation:
A scientific theory is a well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experimentation. It is not a mere guess but a reliable account of the real world with substantial evidence supporting it. Theories are not likely to change easily and require significant contradictory evidence to be altered.
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