A is a possible explanation of or answer to a scientific question that is based on prior knowledge or research and is testable.
A is a statement of fact that is generally accepted to be true and universal because it has always been observed to be true.
A is a hypothesis or set of hypotheses that is accepted to be true based on observations and repeated experimentation with similar results.
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A hypothesis offers a possible, testable reason for an observation. Scientists test them, often by repeating experiments. A theory gives a broad explanation, and it has support from a large body of evidence gathered through many tests and observations by scientists. Testing hypotheses again can provide evidence that supports a theory. Cell theory says all living things are made of cells.
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