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PLEASE HELP WITH SCIENCE!!!! Kate gathered three boxes of the same size made of different materials: glass, clear plastic, and aluminum painted black. She placed them on a window sill in the sun for an hour and then measured the warmth of the air in each box. In this experiment, the types of box materials are a(n) __________. A. constant B. dependent variable C. control D. independent variable

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The types of box material are the independent variable
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The right option is; D. independent variable

In this experiment, the types of box materials are an independent variable.

Independent variables are the variables that are changed or controlled by the experimenter in a scientific experiment. Independent variables represent the cause or reason for a result. When the independent variable is manipulated in an experiment, it affects the dependent variable, and the effect is observed and recorded.