Answer:
-In all three parts, the dependent variable was density.
-The independent variable is the one that the scientist intentionally manipulates. In Part I involving the golf ball and table tennis ball, the independent variable was mass.
-In Part II involving the inflated and deflated footballs, the independent variable was volume.
-In Part III involving the baseball, the independent variable was material.
Step-by-step explanation:
correct on edge! hope it helps :)