Hypothesis, Educated guess based on observation, Experiment , Test for a hypothesis, Theory, A hypothesis that has been supported by many different experiments, Principle, Arises from a theory that has been shown to be valid when fully tested over a long period of time, Observation, When something is noticed in an experiment, Data, Measurements, observations or information , Conclusion, Summary of results of an experiment, Variable, A factor that may change in an experiment , Control , Biological comparsion for the experiment, Replicate , Repeat of an experiment , Double blind testing , Neither the been tested nor the tester knows who is receiving the real treatment and who is receiving the placebo .

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