You've made the hypothesis that the higher the density of a rock, the higher the temperature at which it will melt, because a de
nser rock contains more material. What should the dependent variable be in an experiment testing this hypothesis?
A. the size of the rock
B. the color of the rock
C. the density of the rock
D. the temperature at which the rock melts
The dependent variable in this context is the temperature at which the rock melts.
The density of the rock is the independent variable.
An experiment is usually made up of dependent and independent variables.
The dependent variable is the effect in an experiment. Here we see that the reason why the rock melts at a higher temperature is because it has a higher density and it contains more materials.
The independent variable is the density of the rock. It is the cause.
Biotic mean alive, so we can cut off the first 2 easily. Aquatic birds eat frogs, so that one is safe for now. A decrease in something parasitic usually helps the population, so D is out too. The only one left is C.
