1. Hypothesis: a prediction to be tested Variable: factor that changes in an experiment

2. Independent variable: Factor that experimenter changes on purpose Dependent variable: factor that responds to the manipulated change of the IV

3. Control: the standard of comparison Constants: factors that are kept the same

4. Experiment: a test of a hypothesis Theory: explanation of things or events based on observations and experiments

5. Scientific Law: statement about how things work in nature that seems to be true all the time