If you can have more than 1 answer then the dependent variable is graphed on the Y-axis and and is usually used for comparison since they are usually the experiment results. If you can only have one answer then the dependent variable is graphed on the y-axis.
Primary:
Grasshopper
Mouse
Grass
Secondary:
Hawk
Snake
Coyote
Alpha particles are relatively heave and can be stopped by a sheet of paper.