Final answer:
The graph represents disruptive selection, where extreme traits are favored over average traits.
Step-by-step explanation:
The form of natural selection represented by the graph is disruptive selection.
Disruptive selection occurs when phenotypes in the middle of the range are selected against, resulting in two overlapping phenotypes at each end of the distribution. This means that extreme traits are favored over the average traits.
In the graph, the original population increases to a maximum point at the center and then decreases, indicating that individuals with average traits are being selected against. The population after selection increases, decreases, increases again, and then decreases, showing that extreme traits are being favored and the average traits are selected against. The fact that the maximum of the original population is the minimum of the population after selection further supports the idea of disruptive selection.