The conservation of matter is an example of a scientific:

• A. hypothesis
• B. law
• C. observation
• D. theory

Answer: (B)

Verified step by step guidance

1. Understand the definitions of the terms: a hypothesis is a testable prediction, a theory is a well-substantiated explanation, a law is a statement that describes a consistent natural phenomenon, and an observation is a direct measurement or noticing of an event.
2. Recognize that the conservation of matter states that matter cannot be created or destroyed in a closed system, which is a consistent and universally observed fact.
3. Since the conservation of matter describes a fundamental and consistent natural phenomenon without explaining why it happens, it fits the definition of a scientific law.
4. Differentiate this from a theory, which would provide an explanation for why matter is conserved, and from a hypothesis, which would be a tentative prediction to be tested.
5. Conclude that the conservation of matter is best classified as a scientific law because it summarizes a consistent pattern observed in nature.