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Spanish, 25.02.2020 20:21 mathsux6600

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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