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D:\Students Documents\Biology 1 2

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Transcript

  • 1. How scientists work 1.2
  • 2. Spontaneous Generation
    Hypothesis (disproven) stating that life could arise from nonliving matter.
  • 3. Controlled Experiment
    A test of the effect of a single variable by changing it while keeping all other variables the same.
  • 4. Manipulated Variable
    Factor in an experiment that a scientist purposely changes; also known as independent variable.
  • 5. Responding Variable
    Factor in an experiment that a scientist wants to observe, which may change in response to the manipulated variable; also known as a dependent variable.
  • 6. Theory
    Well-tested explanation that unifies a broad range of observations.
  • 7. Key Concept
    How do scientists test hypotheses?
    Scientists test a hypothesis by an experiment in which only one variable is changed at a time. All other variables should be kept unchanged, or controlled.
  • 8. Key Concept
    How does a scientists theory develop?
    As evidence from numerous investigations builds up, a particular hypothesis may become so well supported that scientists consider it a theory.