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 still in the sun for an hour and then measure the warmth of the air in each box. in this experiment the types of boxes materials are a (n)

A - independent variable

B - dependent variable

C - constant

D-control

Answer: Independent variable

Explanation:

Independent variable can be defined as the variable that can be changed by the experimenter.

The dependent variable depends on the independent variable as it changes depending on it.

Here, the experiment is to see the effect of sunlight in the different types of boxes which is made of different materials.

The boxes are made of different material and this is an independent variable in the experiment.

the types of boxes materials is the independent variable