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Key Components of an Experiment
Independent Variable: The factor you change or manipulate in the experiment.

Dependent Variable: The factor you measure or observe in response to changes in the independent variable.

Constants: Conditions or factors that are kept the same throughout the experiment to ensure that any changes in the dependent variable are due to the independent variable alone.
1. What is the independent variable (IV) in this study?
2. What is the dependent variable (DV) in this study?
3. List 2-3 constants in this study. 
Ethan, a middle school student interested in astronomy, 
investigates how the Moon's phases affect tidal heights in the coastal town where he lives.

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