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) dependent variable
(b) constant
(c) independent variable
(d) control
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Kate gathered three boxes of the same size made of different materials: glass, clear plastic, and al...
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