The correct response is: A theory explains why a phenomenon occurs, whereas a law describes what happens.
Explanation:
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Scientific Theory: A theory provides a comprehensive explanation of phenomena based on extensive evidence and observations. It helps to understand the underlying mechanisms and reasons for a phenomenon.
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Scientific Law: A law describes a consistent and universal observation about nature, often expressed mathematically. It tells us what happens under certain conditions but does not explain why it happens.
Thus, the distinction lies in the function and nature of theories and laws in scientific understanding: theories explain causes, while laws describe observed behaviors.