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

C. Independent variable, An independent variable is defines as the variable that is changed or controlled in a scientific experiment. ... Independent variables are the variables that the experimenter changes to test their dependent variable. A change in the independent variable directly causes a change in the dependent variable.

Make my answer the brainliest

he can get bullied, be friended, or make friends : d

pls give brainliest : )

i hope i because there was no text in the question

god bless!

                      : d : d : d : d : d : d : d : d : d : d : d : d : d : d : d : d : d : d