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D:\Students Documents\Biology 1 2
 

D:\Students Documents\Biology 1 2

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    D:\Students Documents\Biology 1 2 D:\Students Documents\Biology 1 2 Presentation Transcript

    • How scientists work 1.2
    • Spontaneous Generation
      Hypothesis (disproven) stating that life could arise from nonliving matter.
    • Controlled Experiment
      A test of the effect of a single variable by changing it while keeping all other variables the same.
    • Manipulated Variable
      Factor in an experiment that a scientist purposely changes; also known as independent variable.
    • 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.
    • Theory
      Well-tested explanation that unifies a broad range of observations.
    • 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.
    • 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.