1.4. Scientific Theories

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What is the germ theory of disease?

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The germ theory of disease is the concept that microorganisms, such as bacteria or viruses, are the cause of disease.

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What is the first step a scientist takes to find answers to scientific questions?

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The first step is to develop a hypothesis, which is a proposed explanation that tries to explain an observation.

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What must scientists do to collect evidence to support or disprove their hypothesis?

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Scientists must conduct experiments.

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What are the three characteristics of evidence in scientific research?

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1. A direct, physical observation of something or a process over time. 2. Usually something measurable or 'quantifiable.' 3. The data resulting from an experiment.

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Give an example of evidence supporting the law of gravity.

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An apple falling to the ground is evidence in support of the law of gravity.

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What is a scientific law?

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A scientific law is a statement describing what always happens under certain conditions, such as the law of gravity.