Which term describes a well-supported explanation that has been repeatedly tested and verified?

• A. Evolution
• B. Theory
• C. Genetic Variation
• D. Proteins

Answer: (B)

A scientific theory is a well-supported idea that has been repeatedly tested and verified. It combines many observations and experiments into a single framework, and it makes predictions that scientists can test through further observation and experimentation. Because it rests on a large body of evidence, a theory helps explain a wide range of phenomena and can guide new discoveries. It isn’t just a guess; it’s built from extensive data and remains robust even as new information is added, though it can be refined if new evidence requires. The other terms refer to specific concepts or components—such as a process, a mechanism, or a molecule—rather than the label used for a thoroughly tested and supported set of explanations.