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(Disproven)
Hypothesis stating that life could arise from nonliving matter
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| A test of the effect of a single variable by changing it while keeping all other variables the same |
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| Factor in an experiment that a scientist purposefully changes |
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| Factor in an experiment that a scientist wants to observe, which may change in response to the manipulated variable |
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| Well-tested explanation that unifies a broad range of observations |
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