The answer to the question is radium (Ra)
Riley can either change the surface area of the object or can change the slipperiness of the material.
<em><u>A molecule </u></em><em><u>can </u></em><em><u>possess polar bonds and still be nonpolar.</u></em>
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Two independent variables could change at the same time, and you would not know which variable affected the dependent variable
