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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