Sheila conducts an investigation to see how the amount of salt dissolved in water affects the density of the water. Which statem
ent best describes the correct plan for her procedure? A The density and the amount of water are controls, and the amount of salt and the type of salt are variables.
B The amount of water and the amount of salt are controls, and the type of salt and the density are variables.
C The type of salt and the amount of water are controls, and the amount of salt and the density are variables.
D The type of salt and the density of water are controls, and the amount of salt and the amount of water are variables.
C. The controls are things that are the same regardless of what other changes you make in an experiment. The variables are what you change (independent variable) and what you measure (dependent variable).
