HYPOTHESIS - a prediction or inference about what will happen in an experiment, CLASSIFYING - grouping objects together according to similar properties, DATA - the evidence gathered, graphed or interpreted during an investigation, INDEPENDENT VARIABLE - the thing you select to change or manipulate in an experiment, DEPENDENT VARIABLE - the thing you are measuring or observing during the experiment (the results), CONSTANT - things or conditions in an experiment that must stay the same during the experiment, MODEL - a picture, an idea or object (often larger or smaller) that represents an object or process,

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