Three line graphs, where the dotted lines represent 'Original distribution' and solid lines represent 'New distribution as a result of selection.'

1. In Directional Selection, the graph is plotted between 'Beak Size' in x-axis and 'Number of Birds in Population' in y-axis. Both dotted and solid line make bell shaped curve. Solid line curve is ahead of dotted line curve showing increase in average beak size.
2. In Stabilizing Selection, the graph is plotted between 'Birth Mass' in x-axis and 'Percentage of Population' in y-axis. The dotted line makes stretched bell shaped curve and the solid line makes skewed bell shaped curve showing babies with an average mass are more likely to survive.
3. In Disruptive Selection, the graph is plotted between 'Beak Size' in x-axis and 'Number of Birds in Population' in y-axis. The dotted line makes a bell shaped curve and the solid line makes 'M' shaped curve showing smaller beaks and larger beaks.