The variables for this experiment include mass, volume, and the materials in the various balls, as well as their densities. In Part I, you will be comparing a table tennis ball and a golf ball. Use the drop-down menus to complete the sentences and identify the independent and dependent variables. In Part I, the independent variable, the one that is intentionally manipulated, is . In Part I, the dependent variable, the one that you measure the response in, is .